Stock or built transmission

[twicks69]

, I always loved the "return" box of broken parts to have as a trophy! Unfortunately, I have alot of those trophies....

 

[Talipse96]

WOW, I almost gave up after not getting any info, then Tim came through. Thank you.

When making the title I thought about those guys that say useing stock gears isn't a "built" transmission. I don't plan on going with a dog box so please bear with me. I don't plan on welding my center diff. I would like to keep it streetable but take it down the track a couple times, its not my DD. Its a project.

Now I know a lot more than I did but I'm still curious on how a lot of this works. I have built 13 engines but have not yet dug into a transmission. I am a little intimidated by it so I figure I would leave it to somebody else.

I understand the double syncro is to speed up the next gear for smoother enguagement, is that right?
Do I really need the double syncros? I understand that I need to upgrade my 3rd gear so I don't strip it and possibly shot peen some other gears. I would like to upgrade my 5th gear to a 15% taller gear.

So really I could just shot peen my stock gears, replace the shims and syncros, and upgrade my shift forks and be pretty well off?

 

[empie1]

Mine was a 2-3 shift trying to get my NLTS setup for the track... I lost 3rd/4th gear but still had 1,2,5,R so I babied it to a buddies to take a look. After verifying the obvious... ...I left his house to baby it home and the trans. was locked in 1st, that was the longest 15 mile drive ever!

Thats not even half of the damage Empie, Shep is sending the rest of the damaged goods in a seperate box...

Im sure you had a nice 5k ride .

 

[twicks69]

WOW, I almost gave up after not getting any info, then Tim came through. Thank you.

When making the title I thought about those guys that say useing stock gears isn't a "built" transmission. I don't plan on going with a dog box so please bear with me. I don't plan on welding my center diff. I would like to keep it streetable but take it down the track a couple times, its not my DD. Its a project.

Now I know a lot more than I did but I'm still curious on how a lot of this works. I have built 13 engines but have not yet dug into a transmission. I am a little intimidated by it so I figure I would leave it to somebody else.

I understand the double syncro is to speed up the next gear for smoother enguagement, is that right?
Do I really need the double syncros? I understand that I need to upgrade my 3rd gear so I don't strip it and possibly shot peen some other gears. I would like to upgrade my 5th gear to a 15% taller gear.

So really I could just shot peen my stock gears, replace the shims and syncros, and upgrade my shift forks and be pretty well off?

You had this thread for less than 2 days before my post, sometimes it takes time, so be patient.

As for shot-peening stock gears, I would recommend using NEW unstressed gears instead of worn gears that have been stressed. If you intend on shot-peening your used gears, I would strongly recommend having them wet magnafluxed, then deburred, then shot-peened.

Being that you have a 95-99 transmission, there are no "upgraded" shift forks that are straight drop-in unless you swap out to the late 91-early 92 gear 3rd/4th gearset like I mentioned before.

As for the taller 5th gearset, it is a negligable change of around 300-400rpm drop at the same vehicle speed. For the few hundred dollars, you can better spend it in other places.

I would recommend bearing replacement, HD 3rd/4th gearset/rail/fork, 4-spider center diff, and only a double-synchro 2nd gear (98-99 2nd gear).

If you have not done it before, I would probably recommend that you have someone that has experience with these transmissions do the work.

 

[Talipse96]

You had this thread for less than 2 days before my post, sometimes it takes time, so be patient.

Sorry, I just didn't want it lost in all the other threads and left unanswered.

As for the taller 5th gearset, it is a negligable change of around 300-400rpm drop at the same vehicle speed. For the few hundred dollars, you can better spend it in other places.

I understand, this is still up in the air for me. I do drive on the highway a lot, so it could have its benefites. I have read many threads on the taller gears. I think this is one of those subjects I would do some trial and errors on.

I would recommend bearing replacement, HD 3rd/4th gearset/rail/fork, 4-spider center diff, and only a double-synchro 2nd gear (98-99 2nd gear).

Maybe I missed it. Why only second gear? To make it an easier shift into 3rd? What is the advantage of double syncros?

 

[GRAVEDIGGER]

Maybe I missed it. Why only second gear? To make it an easier shift into 3rd? What is the advantage of double syncros?

Double syncro second gear helps with just that... To help get it into second gear. That 1-2 shift is the one that gets abused the most as it's what is really getting the car up and moving. There's a lot of difference between rpms and vehicle speed in the 1-2 shift range which makes it hard for the syncros to do their job effectively, therefore a double syncro second is added to help with that transition. As you get on up in the shifts the car is usually moving well and there isn't a lot of difference in the rpms vs. vehicle speed so that usually makes for a smoother transition for the syncros between gears up top compared to the 1-2 shift.

 

[-red97rum-]

I know alot more people running with more than 500AWHP that run stock/modified or built automatic DSM's and are more reliable. The weakest link they deal with in very high-HP/TQ applications are still transfer cases (which do have upgrades available).

That's the route I'm going now, I'm almost done with the swap. I broke 3 transmissions within a years time and one of those was a "built" TRE trans. The TRE tranny did shift better than any of the stock ones I've ever used but it was destined to fail because it was a 1990 unit.

Take a look at 4 gear..

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The only thing salvageable was the 4 spider so one of my friends bought it off me for his '90 trans.

 

[DSMTyson]

... wow. Looks like i'm auto swapping my new shell instead. Too much carnage.