Suspension and Chassis Questions about your suspension? Need chassis advice?

Unable to find correct height trans mount

Thread Tools
 
Search this Thread
 
Old Jun 13, 2023 | 06:23 AM
  #1  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Unable to find correct height trans mount

Morning everyone,

Need to find a replacement rubber trans mount but all I have seen are too tall. I'm not even sure which mount I currently have as it's a lot shorter than all the replacements I have seen at parts stores. I bought one from O'Reilly but it's too tall and I have a bad shake. I just can't find one short enough and I'm not sure what I need. I'm not wanting a poly or a solid mount either. I'll attach some pictures of my broken one.

Thanks

Edit: The car is a 1987 350tpi/700r4 car and the local dealer says the mount is discontinued. Does anyone have a mount like this and/or a part#? I have a show on Father's Day I would like to go to.








Last edited by 85iroc87; Jun 13, 2023 at 04:28 PM.
Reply
Old Jun 14, 2023 | 09:22 AM
  #2  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Bump... anyone???
Reply
Old Jun 14, 2023 | 09:30 AM
  #3  
T.L.'s Avatar
Supreme Member
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 1999
Posts: 3,009
Likes: 816
From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: Unable to find correct height trans mount

NAPA Auto Parts...
Reply
Old Jun 14, 2023 | 10:45 AM
  #4  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

I just left there. NAPA is shipping a universal mount to the local store, it looks promising. If it will work I'll post the part#.

Thanks for replying!
Reply
Old Jun 14, 2023 | 12:07 PM
  #5  
TTOP350's Avatar
Supreme Member
20 Year Member
Liked
Loved
Community Favorite
iTrader: (9)
 
Joined: Oct 2001
Posts: 12,215
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Unable to find correct height trans mount

All the china replacements are terrible and don't last.

Only option is the poly stuff but introduces some vibration
Reply
Old Jun 14, 2023 | 12:18 PM
  #6  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Originally Posted by TTOP350
All the china replacements are terrible and don't last.

Only option is the poly stuff but introduces some vibration
Im trying to avoid poly for that reason. The universal mount looks much more like my broken mount height wise. I have also installed the umi torque arm relocation crossmember to take some load off the mount as well.
​​​
Reply
Old Jun 14, 2023 | 03:36 PM
  #7  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Well the universal mount from Napa is still much taller than the old one. I really don't want to run a poly mount but can anyone tell me what the shortest mount is? I'd also much prefer black not red. I'm also very curious why my old mount is so short.

Edit: Here's a side by side of the height issue. The part# is actually A2818. I have part# A2394 in the car now but its only slightly shorter than the one pictured.



Last edited by 85iroc87; Jun 14, 2023 at 06:33 PM.
Reply
Old Jun 14, 2023 | 09:28 PM
  #8  
TTOP350's Avatar
Supreme Member
20 Year Member
Liked
Loved
Community Favorite
iTrader: (9)
 
Joined: Oct 2001
Posts: 12,215
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Unable to find correct height trans mount

Anchor 2394

Doesn't last long from what i understand.
ive also heard of people using a modified 4thgen mount

Reply
Old Jun 14, 2023 | 09:37 PM
  #9  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Originally Posted by TTOP350
Anchor 2394

Doesn't last long from what i understand.
ive also heard of people using a modified 4thgen mount

I've never heard of this before. Do you have a part#? How exactly are they modifying it?
Reply
Old Jun 14, 2023 | 09:55 PM
  #10  
T.L.'s Avatar
Supreme Member
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 1999
Posts: 3,009
Likes: 816
From: Colorado USA
Car: '83 Firebird (T/A Clone)
Engine: 350 with L-69 components
Transmission: 700R-4, 2000 RPM stall converter
Axle/Gears: 10-bolt/3.73 ..
Re: Unable to find correct height trans mount

What makes you think the old, smashed mount is the correct height? I've never heard of anyone having that problem with stock replacement rubber mounts.
I HAVE heard of that problem with polyurethane mounts...
Reply
Old Jun 14, 2023 | 11:04 PM
  #11  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

The old mount wasn't giving me any problems besides being broken. The new mount caused a shake/vibration. I too haven't heard of anyone having this problem.

What about my motor mounts? I know those are prone to sagging. If they are sagging would new ones lower the tail shaft enough to compensate for the taller trans mount?



Reply
Old Jun 15, 2023 | 06:35 AM
  #12  
TTOP350's Avatar
Supreme Member
20 Year Member
Liked
Loved
Community Favorite
iTrader: (9)
 
Joined: Oct 2001
Posts: 12,215
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Unable to find correct height trans mount

Originally Posted by 85iroc87
I've never heard of this before. Do you have a part#? How exactly are they modifying it?

The picture i posted is the anchor brand for 3rdgen.

i think it was the 98-02 mount people are modding. Trim metal to fit and maybe slot the holes? It's been a long time since i saw that. Search for a picture on web then look to see what may need done to fit
Reply
Old Jun 15, 2023 | 09:18 AM
  #13  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

The 4th gen mounts are totally different. I really don't want to do it but how tall are the poly mounts? I know they have a plate but what's the lowest height mount? Also read that energy suspension and prothane are different firmness. I'd definitely want the softest I can get.
Reply
Old Jun 15, 2023 | 09:55 AM
  #14  
DaveyDug's Avatar
Member
iTrader: (3)
 
Joined: Jul 2018
Posts: 288
Likes: 68
From: Ohio
Car: 1989 IROC
Engine: 5.7 TPI
Axle/Gears: 2.77 Posi
Re: Unable to find correct height trans mount

For whatever it's worth, I used an Energy Suspension poly mount without the pre-load plate to match the height of the broken stock mount.

I have no driveline vibration at all.

YMMV.
Reply
Old Jun 15, 2023 | 09:58 AM
  #15  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Originally Posted by DaveyDug
For whatever it's worth, I used an Energy Suspension poly mount without the pre-load plate to match the height of the broken stock mount.

I have no driveline vibration at all.

YMMV.
What was the height of each mount? Do you have a part# for the ES mount?

Thanks for the reply
Reply
Old Jun 15, 2023 | 04:44 PM
  #16  
RBob's Avatar
Moderator
iTrader: (1)
 
Joined: Mar 2002
Posts: 18,432
Likes: 233
From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: Unable to find correct height trans mount

OP, any chance your car has a 2-piece crossmember? These have been an issue for some time. One fix is to swap to a 1-pice crossmember with the run-of-the-mill mount.

RBob.
Reply
Old Jun 15, 2023 | 05:05 PM
  #17  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Originally Posted by RBob
OP, any chance your car has a 2-piece crossmember? These have been an issue for some time. One fix is to swap to a 1-pice crossmember with the run-of-the-mill mount.

RBob.
Factory one piece crossmember.
Reply
Old Jun 15, 2023 | 06:23 PM
  #18  
DaveyDug's Avatar
Member
iTrader: (3)
 
Joined: Jul 2018
Posts: 288
Likes: 68
From: Ohio
Car: 1989 IROC
Engine: 5.7 TPI
Axle/Gears: 2.77 Posi
Re: Unable to find correct height trans mount

Originally Posted by 85iroc87
What was the height of each mount? Do you have a part# for the ES mount?

Thanks for the reply
I think it was the 3.1142G, but its been a few years.
Reply
Old Jun 16, 2023 | 05:08 AM
  #19  
z 28 jari's Avatar
Member
20 Year Member
iTrader: (1)
 
Joined: Dec 2001
Posts: 459
Likes: 2
From: Finland
Car: 1985 Camaro Z-28
Engine: 385
Transmission: th700r4+Edge 2800 stall
Axle/Gears: 3.42
Re: Unable to find correct height trans mount

I replaced trans mount few weeks ago(Ancor 2394).Mount height was 44mm,and bolt thread was M10x1,5(old mount thread was inch thread)
Reply
Old Jun 16, 2023 | 03:04 PM
  #20  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Originally Posted by z 28 jari
I replaced trans mount few weeks ago(Ancor 2394).Mount height was 44mm,and bolt thread was M10x1,5(old mount thread was inch thread)
That's what's in the car now causing the vibrations. I installed that one thinking my old on sagged overtime.

I sent thirdgen ranch an email earlier and waiting to hear back.
Reply
Old Jun 16, 2023 | 03:36 PM
  #21  
BBCSwap's Avatar
Member
Liked
Loved
Community Favorite
 
Joined: Aug 2021
Posts: 418
Likes: 66
From: Central Michigan
Engine: SBC Dart 400 Holley 750 Carb
Transmission: 700R4
Axle/Gears: 28 spline 323 gears
Re: Unable to find correct height trans mount

You might want to check the reviews on thirdgen ranch.

https://www.thirdgen.org/forums/afte...-crooks-4.html
Reply
Old Jun 16, 2023 | 03:48 PM
  #22  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Yeah I've seen that thread but I'm in Illinois and less than an hour away.
Reply
Old Jun 16, 2023 | 05:43 PM
  #23  
85iroc87's Avatar
Thread Starter
Junior Member
5 Year Member
 
Joined: May 2017
Posts: 18
Likes: 1
From: La Grange Park/Countryside IL
Car: 1987 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 9 Bolt/3.27
Re: Unable to find correct height trans mount

Well everyone I at least have a temporary fix. As much as I hate ghetto rigging stuff I can at least drive my car. Those are two stainless bands from a local muffler shop.

I am still obviously looking for a new mount but bought some time.




I really appreciate all the help!
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
ktthecarguy
Interior
22
Aug 23, 2022 07:04 PM
RedLeader289
Engine/Drivetrain/Suspension Parts for Sale
0
Mar 14, 2022 08:30 AM
Branderino
Engine Swap
5
Mar 8, 2020 08:43 PM
project89
Organized Drag Racing and Autocross
13
Dec 9, 2014 11:38 PM
AmorgetRS
Pacific Northwest Region
8
Jul 17, 2001 06:24 PM




All times are GMT -5. The time now is 02:10 AM.