Final Drive ratio on my 87? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-27-2005, 11:06 PM   #1
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Default Final Drive ratio on my 87?

On my 87 LE, what'* the final drive? Is there somethin to look at to tell me? I figured that all the LE'* were the same so i thought i would ask.
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Old 02-28-2005, 12:13 AM   #2
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when talking trans never assume anything.....

look at your RPO codes

will be one of these

FR2 - ratio, transaxle, final drive 2.93
FW2 - ratio, transaxle, final drive 3.06
F17 - ratio, transaxle, final drive 2.84
F79 - ratio, transaxle, final drive 2.97
GX3 - ratio, transaxle, final drive 3.33
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Old 02-28-2005, 12:53 AM   #3
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The 87 will either be 2.73, 2.84 or 2.97...

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Old 02-28-2005, 11:02 AM   #4
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Thanks guys. Which do you think would be the best between acceleration off the line and fuel economy on the highway? Also, it'* not the original transmission, it'* a used one that someone put in a while ago i found out. I just rebuilt it again. So it may not have the same final drive that it had from the factory if the used tranny was from a different car.
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Old 02-28-2005, 11:14 AM   #5
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Well for 87-88 Vin 3, its possible to have a 2.73, 2.84 or the 2.97... I feel that tyhe 2.97 would have been the best of all worlds for that engine...

The 2.73 would have netted you the best MPG on the road...

2.97 would have been the more fun to drive factor... Some of the 87'* were made or ordered with the SE Package... Had a lot of happy happy options untill the SSE came along in 88.... That changed what the bonneville was in my eyes... I loved it...

Even my 91 has the 2.84 gear ratio...

Does your car have a Tach?

Do you turn around 1450rpms @ 50 or 55?

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Old 02-28-2005, 07:45 PM   #6
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YES amazingly enough my base model LE DOES have the full gauge cluster. At 50-55 idk the exact RPM'*, but at 60 on the nose i'm doing 2-2200. But there'* a few things with that, cause i have a feeling that A. My speedo is off (which is probably a mental thing) and B. That my TCC is not engaging on the road. I'm just about to get back to you guys on the Final Drive, i'm runnin out to check it now. I'll get back to all you.
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Old 02-28-2005, 08:41 PM   #7
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OK guys i just ran out to check, and i found something strange. I have NONE of the RPo codes for final drives. I did write down my entire list of codes though, and i am about to put them all down. Can someone look over them and see what they think? Thanks Guys! Here it is: AAA, AG1, AM6, AR4, AU3, A81, A90, CD4, C60, C75, C96, D35, D64, FP3 (?), J41, K34, K90, LG3, ME9, MXO, NA5, N33, N91, PB7 (?), QJR (?), TR9, T63, T87, UM7, UQ1, US6, UT1, U21, U23, U26, U66 (?), VK3, V73, WRN (?), WS1 (?), WS8 (?), W63, X13(?), X15 (?), YT9 (?), 40U, 6DZ (?), 7DZ (?), 78C (?), 78I, 789, 8RN (?), 9RM (?). Ok guys that'* the whole list. If you're wondering what the ? marks are for, those are ones that i could not find on the RPO list which is located in the tech info section. If anyone can fill me in on these that'd be great too. If any one of my superious here can decipher the things i can't find, that'd be great! Thanks everyone.
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Old 02-28-2005, 09:18 PM   #8
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OK third post of the day. I figured out which final drive i have, it'* the 2.73. So i guess mines tuned to MPG not speed. Well i gave it a shot. Also, in case anyone else was wondering, i found a few more RPO codes not listed on here. FP3 is the code for the 2.73 final drive, PB7 is "wheel, 14x6, painted", QJR is "tire, P205/75R14, speed rating N", U66 is "speakers, 4, dual front dash mounted, dual extended range" (which is bogus because i just took mine out and they aren't any better than the plain old delcos), WS1 is listed in a book i have as "bonneville performance value package" whatever that is. and the 78C is garnet red interior. I'm sort of curious to that performance package, sounds cool . lol Thanks for the help guys!
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Old 02-28-2005, 09:53 PM   #9
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so that means the gx3 <3.33> is for best acceleration i have always thought it was the best mpg.
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Old 03-01-2005, 07:12 AM   #10
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lmao, nope. GX3 = FUN!!! 2.97 here.. mm acceleration *drools* [sorry it'* early].


-justin
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