what gears u guys recommend me?
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
what gears u guys recommend me?
i have a 87 GTA 305 5.0 tuned port injection, t5 tranny i think i got a dyno tune also, cuz it was my dads godfathers practice car for circut racing, but any ways yea i wanna have a good gearing for the track and mpg doesnt matter, i heard 3.73"s was too much for my 305 any suggestions?
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
i think its a 8.5 bolt its a 87 trans am GTA 5.0
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
ok yea i was off its a 7.5 10 bolt
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
not sure there stock 3.08"s i think am not sure at all thoa
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#8
Re: what gears u guys recommend me?
If you have 3.08 to 2.14 gears then you will have a 2 series differential and you will need the special thick gears to fit it. If you have 3.23 to 4.10 gears you will have the 3 series differential and you can use the standard thickness gears. If you know that the rear end is original and has not been changed then you can check the RPO code on the sticker and it will tell you what gear is in it. This sticker will be on the bottom of the console lid or on the back of the spare tire cover. The rear end codes start with G. A 3.08 would be GU4 and the limited slip differential woudl be G80.
A 3.42 gear would make a pretty big difference in the performance of the car. I don't know enough about the tuned port engines to say if a 3.73 would be too much or not.
A 3.42 gear would make a pretty big difference in the performance of the car. I don't know enough about the tuned port engines to say if a 3.73 would be too much or not.
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
thanks i will be checking that out to see what i have am sure its original not changed and thanks for the info
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Re: what gears u guys recommend me?
a 3.73 would be fine/fun with the t5. I wouldn't keep the 2 series carrier though, and you probably have the 26 spline axles. The best place to start with would be to find a 88-92 rear with 3.42(preferred) or 3.23 gears. They have the stronger 28 spline axles and would be a 3 series carrier. Swap the rears and if you are lucky enough to find a 3.42 rear you may be happy with just that.
-Jim
-Jim
#12
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Re: what gears u guys recommend me?
The powerband of the engine is choked by the TPI style intake. That said, if you're going to stay with that intake for a while, go 3.42.
Yes, 3.73 gears work fine with it, but you don't gain much in the way of speed or economy going with them.
Yes, 3.73 gears work fine with it, but you don't gain much in the way of speed or economy going with them.
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
yea i ended up going with 3.42 oem gm rear gears it has a 27spline and says it will fit any 2 series or 3 series diffy's so hopefully it works good thanks
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: what gears u guys recommend me?
will fit any 2 series or 3 series
Hopefully you won't find out the hard way that those are REALLY 3 series gears and fail to mesh by around 3/8" on your most likely 2 series carrier.
IMO 3.42 is too much for a stock 305 TPI; good for one with exhaust upgrades (headers) but will force a stock one up into too high RPMs too fast. You won't be able to shift quick enough to keep it from running out of breath. Consider a COMPLETE exhaust system, heads to bumper, as your next mod. Assuming of course that the gears work for you at all.
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
this shop that i ordered the gears from said it would but if anything ill swap the rear ends with my bro in laws 90 camaro and give him mney and my rear end, and his rear is posi, also am gonna run a 2030 crane cam so it will extend my rpms a lil bit more, but i know the tpi"s run out of breath
#16
Re: what gears u guys recommend me?
Sofa is right, a gear will only fit a 2 series or a 3 series. It can not fit both. Someone told you a lie or you misunderstood what they said. All of the GM 3.42 gears are made for the 3 series differential. If you currently have a 3.08 then you have a 2 series differential. It aint gona work.
I have a feeling this isn't going to have a happy ending.
I have a feeling this isn't going to have a happy ending.
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
Had a feeling it was too good to be true but oh well ill just order the bearing spacer to make it fit, good thing I didn't buy the gears new, thanks guys u helped me from making a big mistake
#18
Re: what gears u guys recommend me?
You mean a ring gear spacer? That's another bad idea. If I still had my webshots account I'd show you some pictures of exactly why it's a bad idea. Why don't you just get the correct parts and do it right the first time so you don't have to go back and do it right the second time?
#19
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Car: 1987 trans am GTA ws6 package
Engine: tuned port injection 305 5.0
Transmission: t5 5speed manual
Axle/Gears: 3.08 i think
Re: what gears u guys recommend me?
Dammit lol 3rd gens are a headache and expensive now
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Car: Iroc-Z
Engine: TPI 305
Transmission: T5
Axle/Gears: 3.27
Re: what gears u guys recommend me?
It won't... one or the other, but not both. (by itself anyway)
Hopefully you won't find out the hard way that those are REALLY 3 series gears and fail to mesh by around 3/8" on your most likely 2 series carrier.
IMO 3.42 is too much for a stock 305 TPI; good for one with exhaust upgrades (headers) but will force a stock one up into too high RPMs too fast. You won't be able to shift quick enough to keep it from running out of breath. Consider a COMPLETE exhaust system, heads to bumper, as your next mod. Assuming of course that the gears work for you at all.
Hopefully you won't find out the hard way that those are REALLY 3 series gears and fail to mesh by around 3/8" on your most likely 2 series carrier.
IMO 3.42 is too much for a stock 305 TPI; good for one with exhaust upgrades (headers) but will force a stock one up into too high RPMs too fast. You won't be able to shift quick enough to keep it from running out of breath. Consider a COMPLETE exhaust system, heads to bumper, as your next mod. Assuming of course that the gears work for you at all.
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