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Straight cut synchronized gear box!

twicks69

Supporting Vendor
4,103
1,405
Mar 12, 2004
Milwaukee, Wisconsin
Well, if it's a bullshit design, and to my knowledge it has had 4 damaged shafts including both of yours, out of like 600 or 700 or so that have worked just fine with no issues, I would say it works pretty good.

It does come down to machining in alot of cases.

The 4-post ones get issues too, even when you use a factory rear pinion shaft machined to fit, like the shaft TRE does. The speed design ones failed regularly.

Jack's and Shep used stock cross shafts machined down without a heat treatment and it failed quickly.

If you want to make a better part and sell it, go right ahead Kurt. It doesn't bother me. I only was trying to make a good product for the community when it was designed about 14 years ago.
 

keltalon

Supporting VIP
3,477
960
Jun 29, 2003
Luthersville Ga, Atlanta, Georgia
Well, if it's a bullshit design, and to my knowledge it has had 4 damaged shafts including both of yours, out of like 600 or 700 or so that have worked just fine with no issues, I would say it works pretty good.

It does come down to machining in alot of cases.

The 4-post ones get issues too, even when you use a factory rear pinion shaft machined to fit, like the shaft TRE does. The speed design ones failed regularly.

Jack's and Shep used stock cross shafts machined down without a heat treatment and it failed quickly.

If you want to make a better part and sell it, go right ahead Kurt. It doesn't bother me. I only was trying to make a good product for the community when it was designed about 14 years ago.
Yeah I had no problem with the shaft untill I changed my gearing from dsm 1990 to the Evo gearing which required a different center diff to match the later tooth cut. This guy locally swore he could machine the housing by copying the old one. Well in very short mileage it failed. I don't believe it's the shaft design at all for John pointed out to me the reason for the failure. The machinist machined the housing well into the gear area. So this time I let Jon machine the housing the right way with another cross shaft from twick. So this failure was my fault for not sending the housing in to be machined the right way like my first housing!
 

twicks69

Supporting Vendor
4,103
1,405
Mar 12, 2004
Milwaukee, Wisconsin
Jon sent me a video showing that the diff housing was not machined square, and that was the reason for Kelvins damage to the cross shaft and spider gears.
 

keltalon

Supporting VIP
3,477
960
Jun 29, 2003
Luthersville Ga, Atlanta, Georgia
Can't wait to see progress on this and longevity of the units being thought up.
Me too illI definitely keep the thread updated. I am waiting on replacement 8 leg disc for larger shaft so I can get the transmission back in the car.
 

keltalon

Supporting VIP
3,477
960
Jun 29, 2003
Luthersville Ga, Atlanta, Georgia
I've been crazy busy with my company but plan on taking some time soon to install the transmission.

I've been crazy busy with my company but plan on taking some time soon to install the transmission.
Finally got the trans in and man!!! Speechless! I switch back to the stock gear ratio and love it. Interior shot feels aoo good.......
You must be logged in to view this image or video.
 

bastarddsm

15+ Year Contributor
5,524
1,344
Aug 26, 2003
Mendota, Illinois
Go beat on it so we can see how it lasts, but I don't know if it matters. Day 180 of waiting for a response from TRE.

btw, want to part with the 3.909 finals?
 

donk

20+ Year Contributor
125
6
Dec 17, 2002
kalmar, Europe
Well i am a greedy swedish and everything costs more for me since customs and shipping , so a picture of your custom floormat wont make me buy the gearset. haha waiting for moore input as soonn as you have it.

/A
 

keltalon

Supporting VIP
3,477
960
Jun 29, 2003
Luthersville Ga, Atlanta, Georgia
Go beat on it so we can see how it lasts, but I don't know if it matters. Day 180 of waiting for a response from TRE.

btw, want to part with the 3.909 finals?
Yeah what do you need? I have the rear pinion, ring gear and large front ring gear. I installed the lsd in the new unit. Shoot me a pm with an offer and I'll get this stuff headed your way.

Well i am a greedy swedish and everything costs more for me since customs and shipping , so a picture of your custom floormat wont make me buy the gearset. haha waiting for moore input as soonn as you have it.

/A
LOL. Got you. I have been breaking in the tranny the gears whine, but its nothing like all this mess posted on the internet I have fell in love with the gear ratio. Yeah, ill keep you updated but not going to abuse it just to see if it will break as some are proposing, but I will drive it hard from time to time when the need arises. Overall very satisfied with tre services I just had to be patient as Jon did what he does best.
 
Last edited:

keltalon

Supporting VIP
3,477
960
Jun 29, 2003
Luthersville Ga, Atlanta, Georgia
T
@keltalon, there is a definition to "beast mode", and it's your car, haha! I hope this trans lasts a good bit of time with all the detail you've put into it.
Not to derail the conversation, but @twicks69 how did the Adelia(spell check) Magic coupling work for you?
Thanks my friend.
 

twicks69

Supporting Vendor
4,103
1,405
Mar 12, 2004
Milwaukee, Wisconsin
@keltalon, there is a definition to "beast mode", and it's your car, haha! I hope this trans lasts a good bit of time with all the detail you've put into it.
Not to derail the conversation, but @twicks69 how did the Adelia(spell check) Magic coupling work for you?

Works great, I have a bit more rear bias and definitely is noticeable. I have all the reaction balls in it too, along with full locking front and rear clutch type diffs so it's pretty noticeable.
 

keltalon

Supporting VIP
3,477
960
Jun 29, 2003
Luthersville Ga, Atlanta, Georgia
Nice, would you recommend it?

How much power you running?

Mainly street?

Any issues?
Definitely would recommend it. My car is around 859whp. currently i am looking for a shell was in a fender bender last february. The transmission is amazing I love the even gear ratios it whines but not as bad as I thought it would since 5th gear is stock I dont have to listen to the whine all the time.
 

Mham2k

10+ Year Contributor
276
43
Feb 8, 2008
Dallas, Texas
Definitely would recommend it. My car is around 859whp. currently i am looking for a shell was in a fender bender last february. The transmission is amazing I love the even gear ratios it whines but not as bad as I thought it would since 5th gear is stock I dont have to listen to the whine all the time.

Thanks!
 
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