lt1 t56 or ls1
#1
lt1 t56 or ls1
Hi to all the t56ers
Which unit do I start with for a start from scratch t56 swap.
1981 vette org. auto with dart 400 block 2 piece main going in
complete frame off with interior gutted at the moment. Great time to do it
if I am going to. I have heard and read so many conflicting perspectives
on which donner to start with. LS1 or LT1 T56 ?
Thanks
Which unit do I start with for a start from scratch t56 swap.
1981 vette org. auto with dart 400 block 2 piece main going in
complete frame off with interior gutted at the moment. Great time to do it
if I am going to. I have heard and read so many conflicting perspectives
on which donner to start with. LS1 or LT1 T56 ?
Thanks
#2
Drifting
the lt1 t56 uses the same mounting bolts as the sbc based dart block, using a two piece rear main will require a specific flywheel as the t56 is designed for use with 1 pc rear main. The 93 lt1 had different gears (cant remember the specs) and was also rated at a lower hp/tq, I have heard the ls1 t56 uses a different throw out baring set up than the lt1 (please someone chime in if you know for a fact). I believe stock t56s were rated at a best of 450 tq, why not pick up a 5spd from richmond or another company so you can run numerically lower gear and still have performance and overdrive for highways.
#3
Instructor
Member Since: Jan 2007
Location: Carolina raised but in Loveland CO for tha duration
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Hi to all the t56ers
Which unit do I start with for a start from scratch t56 swap.
1981 vette org. auto with dart 400 block 2 piece main going in
complete frame off with interior gutted at the moment. Great time to do it
if I am going to. I have heard and read so many conflicting perspectives
on which donner to start with. LS1 or LT1 T56 ?
Thanks
Which unit do I start with for a start from scratch t56 swap.
1981 vette org. auto with dart 400 block 2 piece main going in
complete frame off with interior gutted at the moment. Great time to do it
if I am going to. I have heard and read so many conflicting perspectives
on which donner to start with. LS1 or LT1 T56 ?
Thanks
Jerre
hill@uncc.edu
#4
Drifting
The LS1 T56 trans are a bit stronger than the LT1 and I believe use a hydraulic throw out bearing. On the LT1 T56 stick with 94-97 as they are stronger than the 93' and can also be upgraded to LS T56 strength, but still are pretty tough stock. I bought one out of a 94' Trans Am with 80,000 miles on it and was used to drag race with slicks and nitrous, run 10 sec quarters. Fluid was clean, has a some whining in 5th and 6th gears, but runs and shifts nice. I'll rebuild it with upgraded parts when I get around to it.
Here's a thread I did on my trans swap.
http://forums.corvetteforum.com/c3-t...gs-list-8.html
Here's a thread I did on my trans swap.
http://forums.corvetteforum.com/c3-t...gs-list-8.html
#5
Burning Brakes
Hi to all the t56ers
Which unit do I start with for a start from scratch t56 swap.
1981 vette org. auto with dart 400 block 2 piece main going in
complete frame off with interior gutted at the moment. Great time to do it
if I am going to. I have heard and read so many conflicting perspectives
on which donner to start with. LS1 or LT1 T56 ?
Thanks
Which unit do I start with for a start from scratch t56 swap.
1981 vette org. auto with dart 400 block 2 piece main going in
complete frame off with interior gutted at the moment. Great time to do it
if I am going to. I have heard and read so many conflicting perspectives
on which donner to start with. LS1 or LT1 T56 ?
Thanks
Another thing to think about is gear ratios. The double overdrive T56 was used with injected vehicles that can turn the 6th gear at a lower RPM. Depending on your cam and power/torque band of the engine, it might not be happy with just a trans swap. Just sayin - I would match engine, trans, rear gear, and tire diameter for best results.
Last edited by 74modified; 03-30-2014 at 10:49 AM.
#6
Burning Brakes
GTO T56, QuicktimeT56 to SBC bellhousing. SBC clutch/flywheel and the GTO hydro throwout bearing. Ive done 2 other sbc cars with the LT trans and bellhousing. Very limited clutch options (pull type clutch) and the flywheel is expensive if you have a 2pc rms.
#7
Le Mans Master
Being a relatively short-term and to some extent unloved engine series, the LT1/LT4 wouldn't be my choice. I did a swap of an LT1/460 in a buddy's Nova, and while it was relatively straight-forward I didn't think it was a great swap in terms of HP/$
There's some aftermarket stuff out there, but nowhere near what there is for GEN I and GEN III+
There's some aftermarket stuff out there, but nowhere near what there is for GEN I and GEN III+