Breazlan

iTrader: (1)

I have an 86 Trans Am with TPI. I bought it with 2.77 rear gears. I recently come to hear that the 86 has 3.27 gears. Which did they have, or both? If both, which was standard? Did they start with one and then switch?

RB83L69

Depends on the motor and trans combo

Breazlan

iTrader: (1)

I thought there was only one TPI in 86 and it came with the AT.

RB83L69

85 may have been like that; don't know about 86 though... seems like there were 5-speeds that year. But TPI cars didn't interest me much so I could easily be wrong.

Breazlan

iTrader: (1)

I am only refering to TPI cars in 86. Just wondering if there really was more than one available. I only noticed 2.77 so far.

Guest

No 5 speed TPI in 86.

The 3.27 was optional, 2.77 was standard.

Breazlan

iTrader: (1)

Would you say it was a commonly selected option?

Guest

I dont know about that. I've seen a fair share in both configurations.

Trickster

Hello Breazlan,

Go to the site listed below and check your engine size and transmission against it.

https://www.thirdgen.org/newdesign/tech/techdb.shtml


The Trickster!!!!!!!!!!!!

Breazlan

iTrader: (1)

No, I learned long, long ago. That info causes more trouble than what it is worth. It may be fine for the Chevs but I am talking about a Trans Am here. The numbers, the whole G92 thing, it is all based on the Camaro and someone tried to just attach Pontiac stuff to it. Thanks though.

Trickster

The G92 applies to all GM products, whether it is a pontiac trans-am, firebird,firehawk. fiero, or the chevrolet camaro, berlinetta, or lumina. If you have any other doubts about it, why not just call either the ponitac or chevrolet dealer nearest you.

The Trickster!!!!!!!!!!!!!

Guest

A quick look at that chart tells you how wrong it is. They dont list the BW gear ratios.

Most of that stuff has errors. Some people have tried fixing it, but its still far from right.

Mikes86SC

Whichever is the optional gears, 3.23 or 3.27 for 86, I have it.

Breazlan

iTrader: (1)

If you have a 3.2x, you either have a 3.23 in a Camaro or possibly a 3.27 in the TA in 1986.

Hey Trickster, I not sure why you started rambling on about that crap. Lets take two 87 third gens for example. One a camaro with the G92 and a firebird with the same equipment as the G92 camaro. The pontiac does not refer to those same options with G92.

Point here is: Someone asks a question about their firebird and a camaro guy tells him to just go look for the G92 listed and that will tell you what you need to know. NO, that just screws him up.

Each have their own history in the tech stuff but they tried to combine the stats. The way it is set up now, it doesn't work.

This got off the subject. I got from this what I need. Thanks

Trickster

Hey Breazlan,

sorry if that was rambling on about crap to you. However, if you will go back and read the post again. You will notice that not once was anything mentioned about the G92 containing the same options on the camaros as on the firebirds or trans-ams. It was only mentioned that both contain the G92 option code regardless of what each one might have individually. If you would care to check the listing for the G92 RPO code, GM simply refers to it as "AXLE REAR RATIO, PERFORMANCE"

As you said, it is off the subject. Glad you got what you needed.

The Trickster!!!!!!!!!!!!!!!

82RECAROTA

Breazlan:

If your car happens to have the RPO label still in it, or has a build sheet, look for:

GU2 - 2.73
GH3 - 2.77
GU5 - 3.23
GW6 - 3.27
GU6 - 3.42
GM3 - 3.45

Should be one of them. I don't have my Firebird data handy for '86.

I am with you and madmax on the inaccuracy of the Tech Data; not to mention the RPO decoder. Tech Data says that my '82 LG4 Trans Am only has a 2.73, my build sheet says 3.23.

As a former moderator more or less said, "updating the tech data and RPO decoder just wasn't worth the time or bother". Bad thing is, a few other websites copy the same tech data that just perpetuates the misinformation. Small wonder there are so many repetitive questions.

Guest

My SPID is long gone, or I'd help.

My invoice lists a WS1 option, listed as

Option picks for " 86 "

Dunno what all that compromised (I might remember if I rattle my memory banks), but I think the 3.27 is in that somewhere because I dont see it elsewhere.

That or it came with the WS6, but I've never seen that as part of the package.

82RECAROTA

The WS1 OPTION PACKAGE for a Trans Am consisted of:

UM7 - Stereo/Clock
B34 - Mats, Front
B35 - Mats, Rear
CC1 - Hatch Roof

UM7 Eligable Upgrades were:

UM6 - Stereo/Cassette
UX1 - Stereo/Cassette/5 Band Equalizer
UT4 - Stereo/Cassette/5 Band/Touch Control

Breazlan

iTrader: (1)

Do you think, if I wanted to put together a new drivetrain list for the firebirds, I would get some support for it here?

I don't think it would be that tough if lots of people would send me what they have.

To figure out the hardware info, all I would need from people is the first 11 digits from the VIN and all 'G' and 'M' codes and if there is a W66 or Y84 to help determine exact car.

They wouldn't even need to have the car anymore, just some of the printed material it came with.

The power figures I could start with the advertised numbers and make the adjustments from there.

Maybe there is something else that could be added to the list too.