Switched From 10 Bolt to 9 Bolt - Help?
#1
Junior Member
Thread Starter
iTrader: (4)
Join Date: Oct 2001
Location: Pacific, MO
Posts: 81
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1987 Pontiac Trans Am GTA
Engine: 305
Transmission: WorldClass T5
Axle/Gears: 3.70
Switched From 10 Bolt to 9 Bolt - Help?
Thanks to all that have posted on this board. A lot of the posts have already helped me!!!
OK... now for the meat... I have an 87 GTA that came with the 10 Bolt Drum Brake rear. I have switched to the Borg Warner 9 Bolt with a 3.45 gear ratio. Want to see? Go to http://www.seven-of-nine.com/gta.htm
Now for the quesitons... I replaced all of the bearings and seals. Checked all of the gears, etc. I put a new Panhard bar and new control arms on as well. Since putting the 9 bolt in, I have a vibration at 55 - 70 that I didn't have before. Thought maybe I had thrown a tire weight on one of the wheels... balanced them... still have the vibration. Any ideas?
Next question... I need to change the gear for the speedometer. Where do I find info on what part number to order?
Last one! Anyone know where to get a 9 bolt differential cover? I have tried and tried. I don't care about chrome (would actually prefer black). Mine has a very small crack and it leaking some. I could weld it, but prefer getting a new one...
Thanks in advance!!!!
------------------
James
1987 Pontiac Trans Am GTA - 305 TPI - 700R4
http://www.seven-of-nine.com/gta.htm
OK... now for the meat... I have an 87 GTA that came with the 10 Bolt Drum Brake rear. I have switched to the Borg Warner 9 Bolt with a 3.45 gear ratio. Want to see? Go to http://www.seven-of-nine.com/gta.htm
Now for the quesitons... I replaced all of the bearings and seals. Checked all of the gears, etc. I put a new Panhard bar and new control arms on as well. Since putting the 9 bolt in, I have a vibration at 55 - 70 that I didn't have before. Thought maybe I had thrown a tire weight on one of the wheels... balanced them... still have the vibration. Any ideas?
Next question... I need to change the gear for the speedometer. Where do I find info on what part number to order?
Last one! Anyone know where to get a 9 bolt differential cover? I have tried and tried. I don't care about chrome (would actually prefer black). Mine has a very small crack and it leaking some. I could weld it, but prefer getting a new one...
Thanks in advance!!!!
------------------
James
1987 Pontiac Trans Am GTA - 305 TPI - 700R4
http://www.seven-of-nine.com/gta.htm
#2
TGO Supporter
i'd weld the crack and then look for another cover, have you tried gm parts? if they don't have one try the local junk yards. vibration might be hard to track down. are you sure bearings are good, correct preload on pinion? correct back lash and pinion depth? u joints good? drive shaft bend?
------------------
ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
------------------
ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM
#3
Supreme Member
Join Date: Oct 2001
Location: orlando, fl usa
Posts: 1,392
Likes: 0
Received 3 Likes
on
3 Posts
Car: 1986 pontiac TA
Engine: 360 HSR
Transmission: 700r4 3300 yank converter
Axle/Gears: 3.27 9 bolt
<font face="Verdana, Arial" size="2">Originally posted by borgx:
Thanks to all that have posted on this board. A lot of the posts have already helped me!!!
OK... now for the meat... I have an 87 GTA that came with the 10 Bolt Drum Brake rear. I have switched to the Borg Warner 9 Bolt with a 3.45 gear ratio. Want to see? Go to http://www.seven-of-nine.com/gta.htm
Now for the quesitons... I replaced all of the bearings and seals. Checked all of the gears, etc. I put a new Panhard bar and new control arms on as well. Since putting the 9 bolt in, I have a vibration at 55 - 70 that I didn't have before. Thought maybe I had thrown a tire weight on one of the wheels... balanced them... still have the vibration. Any ideas?
Next question... I need to change the gear for the speedometer. Where do I find info on what part number to order?
Last one! Anyone know where to get a 9 bolt differential cover? I have tried and tried. I don't care about chrome (would actually prefer black). Mine has a very small crack and it leaking some. I could weld it, but prefer getting a new one...
Thanks in advance!!!!
</font>
Thanks to all that have posted on this board. A lot of the posts have already helped me!!!
OK... now for the meat... I have an 87 GTA that came with the 10 Bolt Drum Brake rear. I have switched to the Borg Warner 9 Bolt with a 3.45 gear ratio. Want to see? Go to http://www.seven-of-nine.com/gta.htm
Now for the quesitons... I replaced all of the bearings and seals. Checked all of the gears, etc. I put a new Panhard bar and new control arms on as well. Since putting the 9 bolt in, I have a vibration at 55 - 70 that I didn't have before. Thought maybe I had thrown a tire weight on one of the wheels... balanced them... still have the vibration. Any ideas?
Next question... I need to change the gear for the speedometer. Where do I find info on what part number to order?
Last one! Anyone know where to get a 9 bolt differential cover? I have tried and tried. I don't care about chrome (would actually prefer black). Mine has a very small crack and it leaking some. I could weld it, but prefer getting a new one...
Thanks in advance!!!!
</font>
#4
Junior Member
Thread Starter
iTrader: (4)
Join Date: Oct 2001
Location: Pacific, MO
Posts: 81
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1987 Pontiac Trans Am GTA
Engine: 305
Transmission: WorldClass T5
Axle/Gears: 3.70
Thanks for the replies!
The most pressing issue for me is the speedometer gear to set the speedo to read acurately. Anyone know the part number for a 700R4 with the 9 bolt 3.45 ratio rear?
Where do I get it?
Thanks!
------------------
James
1987 Pontiac Trans Am GTA - 305 TPI - 700R4
http://www.seven-of-nine.com/gta.htm
The most pressing issue for me is the speedometer gear to set the speedo to read acurately. Anyone know the part number for a 700R4 with the 9 bolt 3.45 ratio rear?
Where do I get it?
Thanks!
------------------
James
1987 Pontiac Trans Am GTA - 305 TPI - 700R4
http://www.seven-of-nine.com/gta.htm
#6
Junior Member
Thread Starter
iTrader: (4)
Join Date: Oct 2001
Location: Pacific, MO
Posts: 81
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1987 Pontiac Trans Am GTA
Engine: 305
Transmission: WorldClass T5
Axle/Gears: 3.70
Thanks! That sounds bad... didn't think to check whether or not the 3.45 came with the auto... now I'm concerned...
------------------
James
1987 Pontiac Trans Am GTA - 305 TPI - 700R4
http://www.seven-of-nine.com/gta.htm
------------------
James
1987 Pontiac Trans Am GTA - 305 TPI - 700R4
http://www.seven-of-nine.com/gta.htm
Trending Topics
#10
Moderator
Join Date: Jan 2000
Location: Mercedes Norte, Heredia, Costa Rica
Posts: 20,981
Likes: 0
Received 9 Likes
on
8 Posts
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
15T Gray (8642620) Drive, 42T Green (25513049) Driven
or
16T Blue (8640518) Drive, 44T Dark Gray (25513051) Driven
or
16T Blue (8640518) Drive, 44T Dark Gray (25513051) Driven
#11
We can help. Please send complete request to houser@rearman.com . We may still have 9-bolt covers on hand. (We usually blast and paint rear housings and covers with black enamel.) Include phone number. Contrary to someone's rude remark, I want to help. I prefer to get the details and refer to a pro mechanic than to tell you what I think I remember from my car...
Thread
Thread Starter
Forum
Replies
Last Post
ambainb
Camaros for Sale
11
04-25-2016 09:21 PM
355tpipickup
Engine/Drivetrain/Suspension Parts for Sale
1
08-25-2015 12:54 AM