I was thinking of other possible sources for transmissions for the Fiero, especially the manual transmissions. I remember that I once worked with a lady that had a Cadillac Cimmaron with a V6 and a manual transmission.
I don't know if it was a 4-speed transmission or a 5-speed, nor what year it was. I think the Cimmarons were made along the same period of time as the Fiero and maybe on into the early 90's. I seem to recall that some model years or trim lines had pop-up headlight doors, too.
Has anyone ever looked into these as possible sources?
I just found a GM spec that says the 85 V6 had an MX6 4-speed. Is this the same as tne 85 and 86 Fiero 4-speed? The Cimarron also used the THM125C, so the bellhousing is the same. ... Fiero transmission M17 : TRANSMISSION, MAN 4 SPD, MUNCIE, 76MM, 3.31 1
Then that rpo listing was incorrect and they must have been putting the Econo 4-speed in the Cimarron. If that's true, then the Econo 4-speed was available from 85, all the way up until 88 when they stopped production.
The Fiero Econo 4 speed was in 1984 only and had a FDR of 3.32. It was called the MY8. The Cadillac transmission must be slightly different if it is called a MX6. Perhaps the difference is in the front wheel drive linkage. Not many Cimmerons got a manual transmission! It was a sad car, built when GM had no idea why German cars were selling well.
84, 85, & 86 Pontiac 6000 used the MX6 also.
[This message has been edited by Gall757 (edited 01-13-2018).]
I would expect that being for FWD, it had the cast mounting brackets for the cables like the 84 Fiero trans had. You're probably right that there weren't many with manuals but they were available all the way up until June of 88 when they ceased production of the Cimarron. I did see that the trans was also used in the J6000 and also in an Oldsmobile. I think it was the Cutlas Euro or something like that.
I've been trying to find images of a Cimmaron manual transmission. The only thing I found that I could really make out was a 5-speed. Essentially, it looked the same as our transmissions, but the gear levers were a little different, and it looked like the clutch release arm was down on the side so that it was actually attached to the clutch fork arm. I also did a search for Cimmaron slave cylinders, and the one I found was more on the style of the Getrag, having no mounting studs. It had what appeared to be about a 2 inch pushrod that just barely cleared the dust boot.
I found this on Nemiga.com. It's listed as a 5-speed Isuzu.