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sb\bb Transmission question.
Posted: Mon Jun 03, 2013 10:14 am
by mopardog
Forgive me cause it's been a while.....when swapping a 727 from a small block to a big block....you need to change the bell housing right? Or will they interchange without a swap? Also, what's quickest way to determine between 904 and 727? My car was originally a bb 400 with 727, but previous owner stabbed a 318 in car when his son blew the 400. Wanting to get this car back right so any info would be greatly appreciated. Other than the power plant she is all original.
Re: sb\bb Transmission question.
Posted: Mon Jun 03, 2013 1:15 pm
by road chicken
Whomever swapped in the small block also swapped in a 904A or 727A transmission behind it. Neither will bolt up to a Big Block.
They are different so you will have to swap to a 727B transmission. The bell housings are cast one piece with the transmission so, unlike a manual, you can't just swap the bellhousing.
Re: sb\bb Transmission question.
Posted: Mon Jun 03, 2013 1:35 pm
by mopardog
thanks for the info roadchicken. Like I said it's been a while and kinda having to relearn everything. I will add that to list of parts to get this weekend.
Re: sb\bb Transmission question.
Posted: Mon Jun 03, 2013 8:38 pm
by road chicken
No Problem, Wish I had a better answer for ya.
Re: sb\bb Transmission question.
Posted: Wed Jun 05, 2013 10:49 am
by gcoupe72
I don't know the source, but I believe there are "adapters" out there to put the LA trans on the B engine.
If you've got a lot invested in the small block trans., this would be another option.
I think people have also used these to put one of the overdrive automatics behind a big block.
Since, in production they didn't build a B engined O.D. trans.