mjanusz95 Posted October 16, 2014 Report Share Posted October 16, 2014 Ok this is not a question about a SS truck but is a question about a high HP truck. I recently built a 383 stroker for my 1995 GMC Sierra and I am having issues with the 4L60E transmission holding up. The truck is lifted 7" and has 35" tires with 3.73 gears. I had the transmission built also but the motor is putting out about 475hp and 500ftlbs torque and it blew the sprang after about a month. I am going to be putting a Dana 60 with 4.56 gears in it but I'm not sure if that will solve all my problems or not.. I have considered cryo treating but I've never heard of anyone doing cryo on a sprang or if it will even make a significant difference or not. Basically I'm looking for a way to keep my 60 trans if possible..if not probably considering an 80 swap. I'm just looking for any input information or past experiences, and if you have any time to share it it is much appreciated! Thanks, Matt Link to comment Share on other sites More sharing options...
12secss e.mack Posted October 16, 2014 Report Share Posted October 16, 2014 call chuck at FLT TRANSMISSIONS Link to comment Share on other sites More sharing options...
mjanusz95 Posted October 17, 2014 Author Report Share Posted October 17, 2014 Where is he located? Link to comment Share on other sites More sharing options...
idahoBLKss Posted October 17, 2014 Report Share Posted October 17, 2014 bulletproofing a 4l60 LMAO!! Link to comment Share on other sites More sharing options...
12secss e.mack Posted October 17, 2014 Report Share Posted October 17, 2014 wood dale IL. phone 603 350 7776 or finish line transmissions.com Link to comment Share on other sites More sharing options...
mjanusz95 Posted October 17, 2014 Author Report Share Posted October 17, 2014 Yeah didn't think it was possible...lol I'll probably end up going to an 80 Link to comment Share on other sites More sharing options...
mjanusz95 Posted October 17, 2014 Author Report Share Posted October 17, 2014 I might have to give Chuck a call..I never hurts to hurts to hear other ideas I might have to give Chuck a call..I never hurts to hurts to hear other ideas Link to comment Share on other sites More sharing options...
2bfast Posted October 17, 2014 Report Share Posted October 17, 2014 Take your medicine and go with an 80 With the power and weight of the truck you will get very good at removing and replacing the 60 You cant cryo treat a sprag. You can upgrade to a 29 element double caged sprag but iv spun 3 or 4 of those Link to comment Share on other sites More sharing options...
mjanusz95 Posted October 17, 2014 Author Report Share Posted October 17, 2014 I'm not that knowledgeable about transmissions but I got a pretty good idea of how they work. When I had it built I told the guy all about the truck, the gear ratio the tire size and the power I was gonna be putting out and I told him I don't wanna have to worry about replacing it and he said my 60 would be fine. At the time I was happy that I could use what I had but I should've just went with my gut feeling that it wouldn't last. I already have the biggest sprag in the trans and he said there's nothing better that I could upgrade to without a completely different trans. Link to comment Share on other sites More sharing options...
12secss e.mack Posted October 17, 2014 Report Share Posted October 17, 2014 FLT also has a great 80 give him a call he will help you out. Link to comment Share on other sites More sharing options...
Downeast Johnny Posted October 17, 2014 Report Share Posted October 17, 2014 Take your medicine and go with an 80 With the power and weight of the truck you will get very good at removing and replacing the 60 You cant cryo treat a sprag. You can upgrade to a 29 element double caged sprag but iv spun 3 or 4 of those Listen to this man!! He knows his chit. Link to comment Share on other sites More sharing options...
mjanusz95 Posted October 18, 2014 Author Report Share Posted October 18, 2014 A lot of people on here do! That's why I come here for help and I appreciate it very much! Link to comment Share on other sites More sharing options...
onebadmax Posted October 21, 2014 Report Share Posted October 21, 2014 Here we go again. People automatically recommending 80e swaps, when they have no idea how to build a trans. OP, I'd call FLT and talk to some who ACTUALLY knows how to build a 60, rather than a bunch of guys who just throw parts at the trans. Link to comment Share on other sites More sharing options...
mjanusz95 Posted October 21, 2014 Author Report Share Posted October 21, 2014 I talked to a guy there named Adam this Saturday, he was recommending a stage 6 4l60 and it looks like I'm gonna go that route. He was very helpful and straight forward about everything, and I would be very confident about buying a trans from them. And their prices are very reasonable compared to other places! Link to comment Share on other sites More sharing options...
12secss e.mack Posted October 21, 2014 Report Share Posted October 21, 2014 I have a level 7 1\2 badboy 4L65E from FLT and I love it , it's been in my ss truck for 4 years and my truck runs 11.50 all day long on 20 lbs of boost Link to comment Share on other sites More sharing options...
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