Help!! 91 LS1 5 SPEED PROBLEMS!!
#1
Launching!
Thread Starter
Help!! 91 LS1 5 SPEED PROBLEMS!!
So What flywheel and clutch do I use for my ls1 5 speed swap. Its a 91 Chevy C1500 on a getrag 5 speed i believe. I tried using a 4.8 flywheel but pressure plate was off by a bit..i can't afford a t56 so anything would help thanks!
#5
Launching!
Thread Starter
There was a pin on the 4.8 flywheel that wasn't on my old flywheel and the bolts were off by a bit, and it was mounted to a 350. This is not the nv3500 my trick is a 91 people say nv3500 didn't come til 93...
#6
TECH Junkie
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So you're trying to mount a SBC pressure plate, clutch disk on a Gen III flywheel?
Remove the pins, ream out the 3 holes that are too small. I would have it balanced too before you bolt it up.
You could also try a complete clutch kit for the Gen III 5 speed if it will fit in the bellhousing.
Remove the pins, ream out the 3 holes that are too small. I would have it balanced too before you bolt it up.
You could also try a complete clutch kit for the Gen III 5 speed if it will fit in the bellhousing.
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#8
TECH Junkie
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This thread might help with pilot bearing, inspection covers, etc:
https://ls1tech.com/forums/conversio...-ls-motor.html
If you would report back what worked, or didn't, on that thread, that would be great.
https://ls1tech.com/forums/conversio...-ls-motor.html
If you would report back what worked, or didn't, on that thread, that would be great.
#9
Launching!
Thread Starter
Thanks for the reply Gary! I did my research and people are saying they took out the pins and the sbc pressure plate fit good so i am going to get the 4.8 flywheel again and take out the pins and see what happens ill let you know what happens.
#12
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I had the same setup in my 68 c10. I used a 4.8 flywheel, and got a clutch setup from an older truck (basically any of the old 10 spline muncie/saginaw/NV style input shaft). all the pins lined up fine in mine and used regular pressure plate hardware for the 4.8 clutch. My stock 5.3 starter worked fine. I still have the whole setup sitting in my garage actually, I pulled it out and went stalled auto when I put my turbo setup on.
As far as the transmission, you actually have a Muncie HM290, they were the predecessor to the NV3500. Almost identical but are rumored to be a bit stouter than the later NV.
As far as the transmission, you actually have a Muncie HM290, they were the predecessor to the NV3500. Almost identical but are rumored to be a bit stouter than the later NV.
#13
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I'm not 100% sure but I think you're going to have to work out some adaption with the Vehicle Speed Sensor (VSS). You need a VSS to tell the computer when the truck is rolling...among other things. I didn't hook up the VSS on my truck and the thing stalled at every stop. Older transmissions often don't have provisions for a VSS. There are aftermarket adapters that fit into your speedometer cable connection of the transmission.