tamatt27

Are the T56's that are in Vipers and Cobras the same as the GM T56's? Will any of them fit behind the LT1 without major modifications?

jmd

iTrader: (4)

For simplicity, you're way better off going with the LT1 T56 since it fits the third gen so well and fits the GM engines pretty easily.

The McLeod bellhousing adapter system will let you run a different T56 trans. behind a Chevy engine but that isn't going to save you a dime or time.

TKOPerformance

Agreed. There a subtle differences between the various T56 models. The '93-'97 F-body trans is the one you want.

1 DwnCam

I heard from a reliable source, that the early models of the T-56 in the camaro's are a little weaker than the viper, but the late models of the camaro T-56 2000,01,02,etc.. are identical to the viper except for the viper casting on the tranny. Also the reason the camaro tranny's are rated at a lower HP and Torque # is so the dealerships have somthing to fall back on when there is a warranty issue.

kairles

iTrader: (2)

93' f-body t56 are the weakest and have different gears and the viper t56 has stronger shift forks than the f-bodys

www.keislerauto.com say's they have viper t56's for gm applications

85TransAm406

iTrader: (1)

The viper t56 has a larger output shaft and bearing, and some minor internal differences. The viper t56 made for a GM app have the stock viper input shaft cut for a 1-1/8 x 26 spline clutch, and use a t5 bearing retainer. The viper one is more like the retrofit T56, with the tranny mount at 21.5", or 1.9" back from stock, but you have to use a mopar hemi output yoke. And run the torque arm off of the tranny (spohn, BMR). They have a mechanical output for the speedo and have a T5 shifter location. Rated at 550 Lb-ft.

TKOPerformance

Officially, per Tremec the later F-body T56s and the Viper T56 are both rated at exactly the same power levels. The '93 F-body T56 was the weakest T56 ever.

85TransAm406

iTrader: (1)

No, officially, per tremec (TTC) the viper tranny, part # TUET 1806, is rated at 550 lb-ft. The f-body t56 is rated at 450, except the 93 which is rated at 400 lb-ft.

TKOPerformance

According to my sources at Tremec the Viper trans, which carries model number 1386-000-018 is rated at 450 lbs/ft of torque. The '93-'37 replacement F-car trans carries model number 1386-000-016 and is also rated to 450 lbs/ft. of torque. This information is several years old, and the only models that begin with a TUET prefix in my information are retrofit applications for 4.6 Mustangs and the Corvette transaxel applications both import and domestic. The information that I have is from 2002, so it is possible that with the redesign of the Viper for the new body style the trans recieved some attention to better withstand the power generated by the new version of the V-10, which is bigger and more powerful.

The factory '93 T56 I believe came with a 2.97 1st gear and was only rated to 400 lbs/ft. Tremec has since discontinued this model of the T56. There was also an application with a 3.36 1st gear that was only rated to 350 lbs/ft. It also carried a 1.35 3rd gear. I'm not 100% sure about the application of this trans, though.

85TransAm406

iTrader: (1)

Well, my viper t56, sitting on the back porch, has that # on a tag on it. Mine is a new viper tranny with a modified input shaft and adapter plate from D&D performance, with steel 3-4 fork and carbon fiber blocker rings (also by d&d).

TKOPerformance

If all it takes to get a 550 lbs/ft rating is carbon blcoker rings and the steel 3/4 fork I'm overjoyed, because that's exactly how I rebuilt my trans! I used all D&D parts when I rebuilt it.

It seemed to me that the newer boxes were starting to carry TUET prefixes in the model numbers, so I bet it's one from a newer Viper.

85TransAm406

iTrader: (1)

they (d&d) said that the tranny came from tremec with a 550 rating, but then they put in the fork and rings, just because they still have seen the stock fork crack and the blocker rings, just because they are better. The viper tranny has the same aluminum 3-4 fork as the f-bodies.

TKOPerformance

Yeah, the only production trans that got a steel 3/4 fork was the '03 Cobra. When I was rebuilding mine I had to hunt high and low to find one because Tremec was out of them due to the '03 Cobra production run. Don't think I didn't give them a piece of my mind about having to hunt for parts for my Chevrolet because Ford finally decided to put a decent trans in their car. I was galf kidding.

I suspect that your trans is a later model Viper unit, which is why it carries the highest torque rating I've ever heard of for a T56, excluding the TR6R version used by the Viper leMans teams, but those have dog and slider synchros, straight cut gears, and cooling pumps.

jmd

iTrader: (4)

They didn't add the carbon fibre blocker rings. F-bodies have had those since the 2001 model year; Vipers even longer.

The "new" of your tranny is where the rating changed. Previous Viper trannies were rated at 450. Newer ones at 550.

TKOPerformance

That's right. D&D told me that my '95 F-body box had the carbon blockers stock. I installed new ones when I rebuilt it, but it wasn't any upgrade over stock.