T5 rebuild
Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
T5 rebuild
anyone on here rebuilt a world class T5? how hard was it? worth it to pay a pro? or should I just buy a rebuilt unit?
Senior Member
Joined: Sep 2007
Posts: 568
Likes: 1
From: Leander,TX
Car: 84 Z28 / 88 Trans Am / 87 base
Engine: L69 H.O. / 468 BBC / 2.8 v6
Transmission: 89 700R4 / TH375B / 700R4
Axle/Gears: 3.73 open / 3.23 posi / 3.42 open
Re: T5 rebuild
Unless you want to keep it for it's originality, I would recomend swapping it for a T56. the T5 I rebuilt for my 94 V6 went well but they're still not as strong.
Joined: Aug 1999
Posts: 858
Likes: 6
From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: T5 rebuild
Not too hard to DIY.. I believe the sticky has the tools needed to do the job, and you can get most parts cheap enough. ( I get my Tremec parts from thegearbox.net)
Supreme Member
Joined: Oct 2001
Posts: 8,113
Likes: 6
From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: T5 rebuild
upgrade to a G-Force case if you want to put lots of power through it,
the T56 is over rated.
no one needs 2 over drives, a close ratio 5 speed with 1 OD is what they should of done.
the T56 is over rated.
no one needs 2 over drives, a close ratio 5 speed with 1 OD is what they should of done.
Joined: Aug 1999
Posts: 858
Likes: 6
From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Supreme Member
iTrader: (7)
Joined: Jan 2009
Posts: 1,176
Likes: 4
From: Moneta, VA
Car: 88 GTA
Engine: 305 TPI
Transmission: WC T5
Axle/Gears: BW 9-bolt 3.27 posi
Re: T5 rebuild
I have rebuilt two T5s, one NWC and one WC. They are a little bit different, but I actually found the WC to be the easier of the two.
The best favor you could do yourself is to go to Hanlonmotorsports.com, and order their DIY T5 DVD. It gives you a step by step teardown and rebuild, with lots of useful tips and commentary. It was well worth the $25 it cost me.
I'm not saying it's for everyone, but if you have the proper tools, it's not that bad of a job.
The best favor you could do yourself is to go to Hanlonmotorsports.com, and order their DIY T5 DVD. It gives you a step by step teardown and rebuild, with lots of useful tips and commentary. It was well worth the $25 it cost me.
I'm not saying it's for everyone, but if you have the proper tools, it's not that bad of a job.
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Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Supreme Member
Joined: Oct 2001
Posts: 8,113
Likes: 6
From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: T5 rebuild
Not really, a T56 is gonna cost a grand easy, for just the trans unless you got good connection. One will spend $1500+ easy for the full set up and change over.
a G-Force case is only $350 and fixes the flex issues that makes a T5 "weak"
It would cost the same or less, more likley less as you don't have to do a bunch of work changing the set up, if the car is already T5 ready with pedals n hydrolic clutch parts.
a G-Force case is only $350 and fixes the flex issues that makes a T5 "weak"
It would cost the same or less, more likley less as you don't have to do a bunch of work changing the set up, if the car is already T5 ready with pedals n hydrolic clutch parts.
Joined: Aug 1999
Posts: 858
Likes: 6
From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: T5 rebuild
http://www.carcraft.com/howto/116_06...ear_ratio.html
A $350 T5 case will just put $350 into someone else's pocket and leave you with the same weak T5.
A $350 T5 case will just put $350 into someone else's pocket and leave you with the same weak T5.
Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: T5 rebuild

Not really, a T56 is gonna cost a grand easy, for just the trans unless you got good connection. One will spend $1500+ easy for the full set up and change over.
a G-Force case is only $350 and fixes the flex issues that makes a T5 "weak"
It would cost the same or less, more likley less as you don't have to do a bunch of work changing the set up, if the car is already T5 ready with pedals n hydrolic clutch parts.
a G-Force case is only $350 and fixes the flex issues that makes a T5 "weak"
It would cost the same or less, more likley less as you don't have to do a bunch of work changing the set up, if the car is already T5 ready with pedals n hydrolic clutch parts.
I wasn't really saying that like I know for sure either way, I was just saying you can make anything strong with enough money.
Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: T5 rebuild
While I'm at it I guess I should ask, what would cause a T5 to lose reverse? I'm not sure how gone it is yet, I'm going to look at it tomorrow.
Junior Member
Joined: Jun 2010
Posts: 9
Likes: 0
From: Long Island NY
Car: 88' Iroc-Z
Engine: Plain 350 for now
Transmission: Abused T-5
Axle/Gears: Moser 9" 4.10s and Yukon locker
Re: T5 rebuild
I remember reading about the case flexing and 3rd gear being the one to go.. If this is true and I bought a rebuild kit about how much would I spend on the rebuild... I would prob go with the gforce case and get a centerforce dual friction clutch for 300.. Including the clutch how much dough am I spending to rebuild it
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iTrader: (7)
Joined: Jan 2009
Posts: 1,176
Likes: 4
From: Moneta, VA
Car: 88 GTA
Engine: 305 TPI
Transmission: WC T5
Axle/Gears: BW 9-bolt 3.27 posi
Re: T5 rebuild
A rebuild kit will cost between 250 and 300... more if you have to buy any other parts (rebuild kits are just small parts and bearings).
For example, my output shaft was beat up where it connects to the input shaft, and it cost $90 to have the shaft repaired.
For example, my output shaft was beat up where it connects to the input shaft, and it cost $90 to have the shaft repaired.
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iTrader: (1)
Joined: Sep 2002
Posts: 2,565
Likes: 10
From: Texas
Car: 1992 Formula Firebird
Engine: 305CID (LB9)
Transmission: World Class T5
Axle/Gears: 10-bolt, 4.10 gears
Re: T5 rebuild
If you want a stronger T5 you need the G-Force rebuild kit. Supposedly those are good for 500-600 foot pounds of torque depending on which G-Force rebuild kit you get. The T56 can be made even stronger than that but either option will cost you some serious cash.
Junior Member
Joined: Jun 2010
Posts: 9
Likes: 0
From: Long Island NY
Car: 88' Iroc-Z
Engine: Plain 350 for now
Transmission: Abused T-5
Axle/Gears: Moser 9" 4.10s and Yukon locker
Re: T5 rebuild
Thanks! So I'm basically looking at around 1000 bones.. Not as bad as I had thought weeewf!
Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: T5 rebuild
I remember somewhere on here reading a thread about using S10 T5 internals which were supposed to be stronger, not I can't find that thread anywhere, am I crazy for thinking such a thread existed?
Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: T5 rebuild
Thanks, for all of the help so far, are there any little things that can be done to a T5 during a rebuild that can improve strength?
Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: T5 rebuild
Re: T5 rebuild
I do a lot more rear ends than transmissions. I haven't had any experience with the G Force case. There are several things that determine the strength of a transmission. The strength of the case is one of them, but the center to center distance between the shafts is probably the most improtant. The T5 was designed as a light duty transmission and there isn't a lot that you can do to improve it. The weak case is one of the problems with this transmission, but you can't change the distance between the shafts.
Thread Starter
Supreme Member

Joined: Nov 2008
Posts: 1,545
Likes: 10
From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: T5 rebuild
I assume the center to center distance determines how large of gears you can put in it, would that be correct?
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