Tremec conversion C4
Thread Starter
Pro
Joined: Jul 2002
Posts: 703
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From: Milwaukee Wi
Tremec conversion C4
I have a 4+3. 135K on both trans and OD. OD is failing and leaking besides. 4+3 is just clunky.
I am 60/40 on doing in spring. A friend of mine has a repair shop and has not yet done one but specializes in older and high perf vettes. He will do.
What can I expect as far as unforeseen issues? I am aware the drive shaft needs shortening(Hurst) but not if I use Silver. Hurst offers the 500 but not 600. SS offers both at same cost. I hear 600 is a more difficult install on clearances?
What are your thoughts?
I am 350HP on motor with add on of 100HP on N20
I am 60/40 on doing in spring. A friend of mine has a repair shop and has not yet done one but specializes in older and high perf vettes. He will do.
What can I expect as far as unforeseen issues? I am aware the drive shaft needs shortening(Hurst) but not if I use Silver. Hurst offers the 500 but not 600. SS offers both at same cost. I hear 600 is a more difficult install on clearances?
What are your thoughts?
I am 350HP on motor with add on of 100HP on N20
Safety Car
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Silver Sports has detailed installation documents on the website:
such as this one
https://shiftsst.com/media/wysiwyg/p...anual_RevA.pdf
I ran into them (Silver Sports) after seeing a mention in one of the Corvette related magazines I get and wanted to see what they were all about (and explored their website out of curiosity).
You should probably print one or more of the install docs off and take them to you friend to read, that will help answer your questions.
such as this one
https://shiftsst.com/media/wysiwyg/p...anual_RevA.pdf
I ran into them (Silver Sports) after seeing a mention in one of the Corvette related magazines I get and wanted to see what they were all about (and explored their website out of curiosity).
You should probably print one or more of the install docs off and take them to you friend to read, that will help answer your questions.
Safety Car
Joined: Aug 2013
Posts: 4,425
Likes: 603
From: Minneapolis Mn
My 86 has a Tremec TR3550 (that's what Tremec said) in it when I bought it. I have been under there while on a lift once. Far as I could tell looks like the C-Beam, slave, bell housing etc are all oem pieces. There is no provisions for a tranny cooler from what I could find and mine was blocked off. One thing, apparently the speedometer sending unit is not compatible with the speedometer. There's a Dakota Digital SGI-5 C wired into the circuit for signal conversion and the speedometer does work with the tranny.
Again, I didn't put it in but one thing that's a little bit of a pain to me is 1st gear is more like a granny. Wish it wasn't quite as steep a gear as it is, but I can live with it as is.
About all I can tell you on it. Hope that helps.
Again, I didn't put it in but one thing that's a little bit of a pain to me is 1st gear is more like a granny. Wish it wasn't quite as steep a gear as it is, but I can live with it as is.
About all I can tell you on it. Hope that helps.
Former Vendor
Joined: Feb 2016
Posts: 76
Likes: 2
I have a 4+3. 135K on both trans and OD. OD is failing and leaking besides. 4+3 is just clunky.
I am 60/40 on doing in spring. A friend of mine has a repair shop and has not yet done one but specializes in older and high perf vettes. He will do.
What can I expect as far as unforeseen issues? I am aware the drive shaft needs shortening(Hurst) but not if I use Silver. Hurst offers the 500 but not 600. SS offers both at same cost. I hear 600 is a more difficult install on clearances?
What are your thoughts?
I am 350HP on motor with add on of 100HP on N20
I am 60/40 on doing in spring. A friend of mine has a repair shop and has not yet done one but specializes in older and high perf vettes. He will do.
What can I expect as far as unforeseen issues? I am aware the drive shaft needs shortening(Hurst) but not if I use Silver. Hurst offers the 500 but not 600. SS offers both at same cost. I hear 600 is a more difficult install on clearances?
What are your thoughts?
I am 350HP on motor with add on of 100HP on N20
for the c4 we offer both tko500 and tko600 for it. Give us a call for more information if interested.
Hurst:Ignacio
Melting Slicks
Joined: Sep 2003
Posts: 2,270
Likes: 118
From: N. Babylon NY
Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
If your car still has the stock 3.07 rear, the 600 will feel just like your stock 4+3, rpm per gear. The 500 will be the same as, ratio wise, as a 3.73 rear gear in your car. Your combo needs to make the call on which one to pick.
Regarding the t56 swap mentioned by Lt4-396, i like mine but... You will NEED a gear swap after you put a Z28 T56 into your car. The 1st gear ratio in a T56 is too high (for me). I'm saving for 3.73s.
Regarding the t56 swap mentioned by Lt4-396, i like mine but... You will NEED a gear swap after you put a Z28 T56 into your car. The 1st gear ratio in a T56 is too high (for me). I'm saving for 3.73s.
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Racer
Joined: Jul 2016
Posts: 320
Likes: 23
If your car still has the stock 3.07 rear, the 600 will feel just like your stock 4+3, rpm per gear. The 500 will be the same as, ratio wise, as a 3.73 rear gear in your car. Your combo needs to make the call on which one to pick.
Regarding the t56 swap mentioned by Lt4-396, i like mine but... You will NEED a gear swap after you put a Z28 T56 into your car. The 1st gear ratio in a T56 is too high (for me). I'm saving for 3.73s.
Regarding the t56 swap mentioned by Lt4-396, i like mine but... You will NEED a gear swap after you put a Z28 T56 into your car. The 1st gear ratio in a T56 is too high (for me). I'm saving for 3.73s.
It really depends on which t56 you get, some had a 3.36 first gear others had I believe a 2.6X first gear ratio.
I'm assuming you have the 2.XX first ratio.
Racer
Joined: Jul 2016
Posts: 320
Likes: 23