75 vette T10 or ST10? close or wide?
Thread Starter
2nd Gear
Joined: May 2010
Posts: 2
Likes: 0
75 vette T10 or ST10? close or wide?
hi guys im just trying to get some info on a trans before i but it. it is in a 75 corvette, and it is a borg warner. would this be a t10 or super t10? how can i tell the difference? would this be a close or wide ratio, and how can i tell if it is close or wide? i may be able to get #'s tomorrow but i also want to know what to look for before i go. any help would be greatly appreciated.
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
Late model GM T-10 transmission. Many mistakenly think it is a Super T-10 but real Super T-10's have cast iron main cases and high nickle gear sets in them. The GM specified T-10 transmissions have softer gear sets and aluminum main cases. They will take around 400-450HP of abuse but for more power, you will need a real Super T-10 or M-22 Muncie. I do like the 2.88 first gear ratios in some of these T-10 transmissions, they work well for getting a good starting ratio with a tall axel ratio. The synchro parts were also upgraded compared to the older T-10 transmission.
Burning Brakes
Joined: Oct 2002
Posts: 914
Likes: 14
From: Aberdeen, Scotland
T -10
I had a T-10 with an alum. case in my old Trans Am. I really liked it! It was light so it was pretty easy to swap out as I kept "bending" drive shafts! I had a built 400 ex GTO in it. It was the first engine my Dad and I built.The ratio (wide) was very well suited to my 3:42 rear! I doubt I even had 400 hp to be honest, maybe close. The transmission held up to abuse.
carbster09
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
There were a TON of Super T-10's with aluminum cases built and put in GM cars in the 70's. The wider ratio (3.42 1st gear) that went into the later Trans Ams and Camaros had nodular cases with stock gears because they were splitting cases and busting teeth off of gears. Solid LT1, the piece you're referring to is a high dollar over the counter Borg-Warner tranny. No production tranny got the high nickel gears, they were available only in the OTC piece.
From what I've been able to determine, the aluminum case and midplate were the weak link in production Super T-10's since they'd flex and allow the gears to move apart. Less tooth engagement - BOOM! I managed to score a 2.88 first gear tranny with a nodular case in great shape, then we installed a nodular midplate to help keep flex to an absolute minimum.
I had a link to a website with a ton of info on these trannies including identification and history, but I can't seem to find it now. It had a chart that you could use to determine ratio, all you had to know was how many rings were on the input shaft.
From what I've been able to determine, the aluminum case and midplate were the weak link in production Super T-10's since they'd flex and allow the gears to move apart. Less tooth engagement - BOOM! I managed to score a 2.88 first gear tranny with a nodular case in great shape, then we installed a nodular midplate to help keep flex to an absolute minimum.
I had a link to a website with a ton of info on these trannies including identification and history, but I can't seem to find it now. It had a chart that you could use to determine ratio, all you had to know was how many rings were on the input shaft.
