Going From A 10" To A 8" Converter

[Sb Valiant]

Can anyone tell me how much et I would see going from a TCI 4000 stall 10" to a T/A 5400 stall 8"? Motor combo is real simple. 344 4.070x3.31" stroke, 12:1 TRW pistons, M1 single plane, W2 heads worked over, .590 Solid FT purple cam, aluminum rods, 850 holley on E85, 1 7/8" headers, 2750 lbs race weight, 904 trans with a brake, and 29.5x10.5 slicks. Also wondering about a low gear set if that's a good
move or not? Thanks guys !

 

[70aarcuda]

about 30 yrs ago..i switched and picked up about 4 tenths...

low gear set are great for heavy cars ,,,,at 2750 race weight.....i would stay with the standard gear....

 

[OldmanRick]

Just going from a TCI to a T/A is a plus in my book . As far as the low 1st gear, I agree with Tony (above) that it's not worth it at your weight.......Unless your trying to run a high gear (low numerical) for some big mph?

 

[Abodybomber]

Win,win,win...a good Turbo Action,destroying anything off the shelf T.C.I. does.Sounds about right, weight wise.

 

[BigBlockMopar]

Going from 10" to 8" alone would let the engine rev faster IMO just because of the less weight needed to accelerate.

I noticed this on my low powered 318 daily '73 where I used a stock mid-'60s 12" convertor and went to a stock mid-'70s 11" convertor in front of a A518.