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Transmission upgrade

574 Views 17 Replies 8 Participants Last post by  MailmanMike
Clutch and 3rd gear synchro just took a massive ****. Decided while the trans is apart I’m gonna build it. What would everybody recommend upgrading? Trying to keep it somewhat budget but also make it worth it.
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What's your budget? You want an LSD in it? Upgrade to carbon fiber synchronizers? What kind of power do you want to ultimately make? Going to leave the motor with the stock turbo or upgrade to something that breathes a little better?
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When you say budget what is number you are looking at?

Just to fix 3rd gear you will need a new 3rd gear, 3rd synchro, and a new 3-4 slider, possibly a new 3-4 fork. You're look at 800 dollars right there in parts. 1-6 cf syncrhos would be about 400. An LSD would be another 750 to 1300 depending on who you go with. Bearings 150, fluid 70, seals 50, and bolts 20. So thats about 2500 for everything.
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LSD and carbon fiber synchros. Worthwhile upgrades.
When you say budget what is number you are looking at?

Just to fix 3rd gear you will need a new 3rd gear, 3rd synchro, and a new 3-4 slider, possibly a new 3-4 fork. You're look at 800 dollars right there in parts. 1-6 cf syncrhos would be about 400. An LSD would be another 750 to 1300 depending on who you go with. Bearings 150, fluid 70, seals 50, and bolts 20. So thats about 2500 for everything.
Right... Which in my opinion puts a Clarke trans in the ballpark for cost comparison, and I'd just rather have them build one for me when that time comes since I know it'll be done right... Of course, that assumes you don't have to eat the $2K core charge, though.... That would be painful.
Right... Which in my opinion puts a Clarke trans in the ballpark for cost comparison, and I'd just rather have them build one for me when that time comes since I know it'll be done right... Of course, that assumes you don't have to eat the $2K core charge, though.... That would be painful.
I’ve been debating this for a few months. I’m going to go with a Clarke trans. I messaged him a couple times about core policy, shipping and turnaround time for a off the shelf.

My biggest concern all along was the core. My trans drives fine and the only issue is whine in 4th and 6th. If I had to eat the core or lose a large amount that would change the equation. He indicated that only a Catastrophic failure would lose the whole core. Most deductions are for a chipped gear or a bent selector fork. A couple to a few hundred bucks.
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Well I got a used ‘15 trans today for $1k. Now do I rebuilt it or just send it with a new slave cylinder?
Any idea how the shifter forks and synchronizers are in it? If there's any doubt as to what condition they're in, I'd crack open the case, at least.... And if you're opening it up, you may as well think about installing an LSD like @TurboGT did with his... And if you're doing that, you may as well upgrade the synchros to the carbon fiber units...

Just think of it as the transmission equivalent of "if you give a mouse a cookie". 😄
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Any idea how the shifter forks and synchronizers are in it? If there's any doubt as to what condition they're in, I'd crack open the case, at least.... And if you're opening it up, you may as well think about installing an LSD like @TurboGT did with his... And if you're doing that, you may as well upgrade the synchros to the carbon fiber units...

Just think of it as the transmission equivalent of "if you give a mouse a cookie". 😄
Yeah so this is the discussion I was just having with my wife. If I send it and it has issues I can build the original trans then swap. I could just open it and look at the forks and synchros and send it. I’m guessing the LSD, synchros, bearings and hardware would be about $2k.
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Yeah so this is the discussion I was just having with my wife. If I send it and it has issues I can build the original trans then swap. I could just open it and look at the forks and synchros and send it. I’m guessing the LSD, synchros, bearings and hardware would be about $2k.
Right... Would probably be about that much depending on the LSD you got. BTW, which clutch are you going with? Stock RS or ST clutch, or something with hopefully more holding ability? I mean, since you've already got the BT, you may as well put something in for a clutch that will hold the power if you wanted to turn the wick up a bit, right? 😈😈
Right... Would probably be about that much depending on the LSD you got. BTW, which clutch are you going with? Stock RS or ST clutch, or something with hopefully more holding ability? I mean, since you've already got the BT, you may as well put something in for a clutch that will hold the power if you wanted to turn the wick up a bit, right? 😈😈
I did a Spec. 3+ for stock FW when I built the motor. I might do a Spec stock type Single Mass FW when I install. See I didn’t want to spend any more money at that time and I wanted to be easier on the trans. Keeping the dual mass. Mainly the synchros I was thinking about. I’m going to do a SS clutch line and RS slave cylinder too.
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Ok so when the trans goes in it’s getting a RS slave cylinder and a SS clutch line. Anyone have suggestions or input on the line? Which one they used and experience with it.
Ok so when the trans goes in it’s getting a RS slave cylinder and a SS clutch line. Anyone have suggestions or input on the line? Which one they used and experience with it.
Go with the Steeda line. Its made by somebody else, but iirc is stainless fittings. I run the Steeda on my Bullitt.

I dont recommend the JPC. The ends rusted up pretty badly.
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Go with the Steeda line. Its made by somebody else, but iirc is stainless fittings. I run the Steeda on my Bullitt.

I dont recommend the JPC. The ends rusted up pretty badly.
Really? I'll have to check mine since I was one of the first to install it.

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Go with the Steeda line. Its made by somebody else, but iirc is stainless fittings. I run the Steeda on my Bullitt.

I dont recommend the JPC. The ends rusted up pretty badly.
Good to know. The Steeda line holding up good so far for you?
Really? I'll have to check mine since I was one of the first to install it.

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Yeah, was not thrilled. Mike is in the same climate, so he will get the same results. He's about 1.25 hours north


Good to know. The Steeda line holding up good so far for you?

It's all stainless, no idea how it couldn't be good. I havn't even pulled the tarp off the Bullitt this year. Could have a ton of hail damage, idk. When I do, and put the battery back in, I'll take a gander.
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Ok so when the trans goes in it’s getting a RS slave cylinder and a SS clutch line. Anyone have suggestions or input on the line? Which one they used and experience with it.
clutchmasters

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Ok I’ve taken my donor trans apart. I think I’m looking at second gear and the synchro interface on the gear looks damaged. The other gears look ok. I’m guessing second still worked ok and didn’t pop out cause I still see the angle towards the drive end of the gear. Thinking I need a second gear. Anyone have input, experience with this or build tips?
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