8HP70 -> 8HP90 on my '70 Cuda - what are differences?

[speedbird1229]

Hi,

I have an 8HP70 nicely fitted onto my 70 Cuda and sitting behind a 5.7 Hemi. However, I would like to change the transmission over to 8HP90 due to a switch to 6.2L supercharged powerplant. Do I understand it right that the physical size of 8HP90 is the same? I'd like to fit the whole setup with minimal extra work ofcourse. I hope that I can fit the transmission nicely to the current enlarged tunnel and hopefully to the same mount location also.

Any insight is welcome... Thanks! 

[Qda71]

70 is 700nm 90 is 900 nm

[cudaragtop]

The 90 is physically larger than the 70.
I haven't seen a direct side by side comparison of dimensions but the 90 is slightly larger and longer with different rear mounting hole locations. Will require a different driveline than the 70 or modification.

Link to a 70 to 90 swap. Not an E-Body but some useful info.
https://www.ramforum.com/threads/8hp70-to-8hp90-swap-useful-info-for-the-next-guy.189355/

[speedbird1229]

The 90 is physically larger than the 70.
I haven't seen a direct side by side comparison of dimensions but the 90 is slightly larger and longer with different rear mounting hole locations. Will require a different driveline than the 70 or modification.

Link to a 70 to 90 swap. Not an E-Body but some useful info.
https://www.ramforum.com/threads/8hp70-to-8hp90-swap-useful-info-for-the-next-guy.189355/

Got it thanks. I hope it's not remarkably larger and fits into our current transmission tunnel. I know the rear mount is slightly misaligned compared to 8HP70 and that can be accomodated quite easily I believe.