im putting small block in my car and the six cyl trans got low gears. need to know what my rpm be at 65 if i just change the bellhousing on my trans and use it.the differential has 3.42 gears and 255 60 15 tires and trans has .76 overdrive gear

 

I dont think thats such a good idea

 

Im only putting a 260 horse motor in it .i know the trans wont take to much i would like to put over 300 horses in it but i cant afford a t56 or tko 500

 

If you are keeping the same transmission and rear the RPM will remain the same.

 

it will be roughly 2100 rpm at 65 mph. i dont see why its a bad idea though

 

a non world class T5 is already a weak transmission to begin with, and putting a V8 in front of one set up for a v6 .....

and isnt the input shaft a different size as well?

 

everybody on here told me the t5 in it right now would hold the power. i asked summit about the input shaft and they say it would work if i changed the bell housing and slave cyl. i could buy a v8 one from a auto salvage but . six cyl one got lower gears . doesnt matter if it wont hold up.any one on here using 6 cyl t5 on v8? also my tach is off but i am not worrying bout it since its gets changed when the motor does

 

Also im gonna rebuild it and throw a short throw shifter on it so that should help it.im just about reworking the whole car

 

i did the same exact thing u did, same gears, v6 tranny, and i did it with a GM performance motor. it holds good. yes ur tac will be off but just get one form autometer. and youll be faster than a iroc because u do have lower gears. trust me i know form first hand experince.