I dont know if all whats told on this true...could someone can confirm? someone have tried different combo of gear set like the one in the below text?
Gear ratios
The topic of available gear ratios has been widely debated due to the numerous applications of this transaxle. The 1987 GM GETRAG Service Manual confirms that there are at least two versions of the GETRAG 282. They were sold under 5 different part numbers based on body and engine usage. RPO code MG2 was used for all GM V6 applications (FWD and the RWD Fiero) and RPO code MG1 was used for the 2.0 L turbocharged engine used Pontiac and Buick. Gear ratios are given below, as taken from the factory service manual.
* 1st gear: 3.50:1 * 2nd gear: 2.05:1 (2.19:1 on 2.0 L turbo and some Quad-4 applications) * 3rd gear: 1.38:1 * 4th gear: 0.94:1 * 5th gear: 0.72:1 * Reverse: 3.41:1 * Final drive ratio: 3.61:1
A version was used in the heavier W-body Grand Prix, Regal, Cutlass Supreme mated to the 2.8 V-6 that has a 3.77/2.19 1st/2nd. Third is assumed to be the same 1.38, but 4th and 5th are not known at this time.
A later version was designed for the high-revving, High-Output Quad 4 engine. This transmission used a 3.50/2.05 1st/2nd, 1.38 3rd, 1.03:1 4th, .80:1 5th, and 3.94:1 final drive.
The GETRAG 282 used in Quad 4-equipped 1990 to 1991 Pontiac Grand Prixs and Oldsmobile Cutlass Supremes is rumored to use a 3.77/2.19 1st/2nd gear while retaining the 3.61:1 final drive ratio.
An export-only version is confirmed to have been built for use in Oldsmobile Silhouette vans sold in some worldwide markets as an Opel Silhouette. It was mated to the Quad 4 engine and uses a 3.77/2.19/1.38/1.03/.80/3.94 gearset.
Mixing of gearsets can be achieved due to the similarity between the various transmissions, but some gears must be interchanged in sets. First, and second gears are all part of the input shaft and cannot be interchanged independently. All transmissions have a third gear ratio of 1.38:1. However, third and fourth gear are clustered on the counter shaft which was available with two different fourth gear ratios: 1.03:1 or .94:1. Fifth gear is independently interchangeable and available with a .80:1 and .72:1 ratio. There is rumored to be an even lower 5th gear of .9-something that was used in the W41 Oldsmobile Cutlass Calais and Achievas only.
From Rodney Dickman:
Application:
General Motors used the Getrag in all 5-speed V6 and Quad 4 applications (And the rare 4-cylinder turbo) and they are all basically identical. They all have a final drive ratio of 3.61:1. In the Quad 4 Getrag's, GM varied some of the gear ratios of the individual gears (1st - 5th) depending on the application but they all retained the 3.61 final drive ratio. On the V-6 Getrag's, 1st - 5th gear ratios are always the same and all have the 3.61 final drive ratio. Quad 4 Getrag's only fit Quad 4's and will not bolt up to a V6 unless you swap the bell housing case half to the V-6 type. A V6 Getrag will also bolt up to the Fiero 4 cylinder, 3.1, 3.4 (push rod and DOHC) and 3.8. In addition, a rare 3.94 final drive was used in the 92-93 Quad 4 hi-performance with the W41 option. This 3.94 final drive gear set can be installed into any Getrag but you cannot get them new anymore and are hard to find used.
[This message has been edited by perry rhodan (edited 09-23-2007).]
Does the gear ratio in the 86-87 and in the 88 Getrag is the same?
On some place they told that the first and second gear are different from year to year. I've read 3.92 (1st) and 2.19 (2nd) for 86-87 and 3.50 (1st) and 2.05(2nd) for 88.
Is it true?
The 3.50/2.05 ratio is often reffered to the FWD V6 cars. Does the 88 only have this ratio or the 88 still have the 3.92/2.19 ratio?
[This message has been edited by perry rhodan (edited 09-23-2007).]
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09:59 AM
Raydar Member
Posts: 41124 From: Carrollton GA. Out in the... country. Registered: Oct 1999
I'm getting ready to swap in a Getrag from a Grand Prix into my Fiero. I guess I should've counted gear teeth before putting the tranny back together.
I also have a copy of the Getrag service manual. And I've had a chance to look at the guts of a Getrag first-hand. Instead of trying to explain how everything works inside the transmission, I'll let you read the tech manual. It goes into great detail. LINK
Blackthree: for what I've read so far from the different combinaison of gear ratio in these Getrag, the W body (with V6 2.8l) like Grand Prix have a different ratio than the Fiero tranny. 3.77 / 2.19 for the first and second gear where the Fiero have all 3.50 / 2.05 first and second respectively (unless someone confirm the assumption that 86-87 dont have the same ratio as this).
But I will need more reasearch on different car club of these model to be able to put together an excel or word file with all the variation. I have to bullet proof all the info I collect.
I wouldn't bother waiting. Will has researched the Getrag to hell and back. He probably knows more about it than the engineers who designed it, by this time.
The Hemmings article is wrong about the ratios. It's also wrong in describing the final drive as hypoid. It's a spur. A hypoid is only used in longitudinal apps.
