QC Performance Transmission Builders (?)
- Thread starter rottenronnie
- Start date
A local shop in Calgary.
What a ride it's been.
Automatic Transmission guys (at best) will agree to disagree!
Just like engine guys (me included)
What a ride it's been.
Automatic Transmission guys (at best) will agree to disagree!
Just like engine guys (me included)
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What sort of power level? I'm going auto and would love overdrive but haven't seen one hold up yet.
I find it odd that the Diesel shops rate their built trannies in Horsepower numbers instead of Torque where diesels shine.
My personal unit ticks ALL of the boxes of the best trannies being sold through the diesel shops- Billet shafts, Red Eagle Clutches, billet servos, strut, anchor, HP bands, multi-disc billet converter, hp valve body, Overdrive mods, etc; etc. (1000+ HP so they say) I just wanted an install and foegeddabouditt unit.
So far, so good, but I've only got around 500 miles on it.
3-4, 4-3 shift is too harsh and is being tweaked.
Other than that, seems good and solid.
Lots of theories on how they should be modified!!
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VENOMOUS1 RACING
Has Left the Room - Banned from VTCOA!
Depending on the stall of your converter, you'll feel a crisp, fast 3-4,4-3 shift as well as all other gears. This is quite normal and it sounds like all of the right parts were used. A quality converter is key as well as the overdrive unit build as Shorty has said. Hope she holds up for ya Ronnie.
Agreed, I went with a billet 26-28 triple-disc from The Converter Shop in Arizona and it's been in there for several years already. It's a great unit.
The O/D unit is stout. The current 3-4/4-3 shift is more of a thump than a shift and will break something eventually. W.I.T.F. would anyone think you need a 3-4 shift like that at 125 m.p.h. is beyond me. I'm going to pull some springs and tone it down into something livable.
It should be fine now as it's overbuilt, like the engine.
Thanks,
Take Care..
05-SRT10-Silver Beast
New Member
Hey whats up guys! Im having problems with my transmission. It has been rebuilt 5 times and craps out within a month of the build. Now I have brought the billet flex plate, drum and intermediate shaft. Upgraded the band, clutches, servo, governor pressure switch and transgo shift kit. The last build the shop machined the stater and placed a bearing instead of the cheap washer. I hope this shit is fixed now but very frustrating. I will look up the guy at Century incase it craps out again. Laters
A common problem is the front band doesn't grab quickly enough or strongly enough to stop the drum from spinning and create the shift.
I'd be using the rigid band (like the old 727) instead of the double-wrap band as you may have heard.
You are on the right track with the Transgo, in my opinion. Some guys don't like them but they come through for me.
And, there is a different calibration requirement when the shift occurs in the 3300 rpm diesel application than for the SRT-10 at 6600+ r.p.m. behind a performance build.
I used to work on 727s back in the day and they lived behind my built 426 Hemi and somewhere along the way, I became lazy. I should have continued to learn..
The 48RE/727 is the simplest automatic out there and one of the most primitive, but built properly they are quite tough and reliable.
Anyway, when your trannies are "under warranty" it is sometimes hard to flush the cash and go somewhere else, but if one shop isn't able to get it to hold together after a couple of tries, they probably won't after the 5th or 6th try either. I spent 5 full months playing "fix the transmission" this season and 5 months represents 95% of our decent driving weather in this part of the continent.
Oh well, hobbies take time to perfect sometimes.
My 2 cents.
Good luck and keep us posted.
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Well, I found another shop yesterday and the owner is also a Hydraulics Engineer.
His trannies last behind engines WAY more powerful than mine.
So we'll see if he can fix the issues before the snow flies!
I can't believe it has been this difficult to get a 48RE to last more than 5 or 600 miles.
The only common piece now from the original build is the case. Maybe it is hooped somehow?? Hmmmmm.
The saga continues...
His trannies last behind engines WAY more powerful than mine.
So we'll see if he can fix the issues before the snow flies!
I can't believe it has been this difficult to get a 48RE to last more than 5 or 600 miles.
The only common piece now from the original build is the case. Maybe it is hooped somehow?? Hmmmmm.
The saga continues...
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VENOMOUS1 RACING
Has Left the Room - Banned from VTCOA!
I thought the last build was holding up Ronnie? What's happening with it?
Well on a w.o.t. kickdown from a 30 mph cruise (with the T/H mode shut off), first AND second come on together and that tries to tear up the 48RE. The truck goes straight UP on the suspension and the engine screams. And that's what has been doing the trannies in. 3 Valve bodies and 2 complete overhauls later and its the same. Its good for about 4 or maybe 5 of those and then the tranny is completely done.
But it doesn't always do that. Sometimes it works "almost" properly, thats the best way I can describe it.
It has changed since I got it back this last time when it seemed like it was solid. The odd part is IT CHANGES when it feels like it.
Maybe it requires an Excorcism.
That's problem #1
Problem 1A is the line pressure. It seems to be backwards according to the scanner when out for a test drive. Lots of pressure at low speeds and really low pressure where it needs to be high. It has an internal hemorrage maybe??
It seems to work fine in T/H mode though; BUT it is currently ignoring the tune for a shift-point and bouncing off of the hard limiter at 6800 so I always have to lift.
It will also kick down INTO FIRST GEAR at 70+ m.p.h. (good thing the S/D limiter works).
It also has a ridiculous 3-4 and a 4-3 shift that will loosen fillings and will eventually break something. It seems as if the O/D clutches are stacking. That's problem #2.
Could I drive it like it is? Yes
Am I going to? No
It is one bitchy 48RE that won't do what it is supposed to.
For now, I'll get it to the dyno, get some tuning passes on it and then rip it out and apart through the Winter.
The guy (Hydraulics Engineer) I went for a drive with today seems to know 75% of what's going on in there but it also has got him going "Hmmmmm"...
He build trannies for the really high hp stuff and likes a challenge.
He now has one.
Good thing it's a hobby!
2016 here we come..
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MOD(S)QUAD
Full Access Member
Ronnie,
There aren't many threads on this forum when a 48re is mentioned that you haven't been involved with, you seem to be the guy with your finger on the pulse.
An internal hemorrhage could be a likely candidate , my trans guy says once you go into it....it's never the same. Good luck and keep us posted
There aren't many threads on this forum when a 48re is mentioned that you haven't been involved with, you seem to be the guy with your finger on the pulse.
An internal hemorrhage could be a likely candidate , my trans guy says once you go into it....it's never the same. Good luck and keep us posted
Will do and thanks.
I won't quit until it is right.
Fortunately I'm dealing with a pretty simple transmission but it seems they can have an almost infinite variety of issues.
It has a bunch of high performance "crap" in it now but getting all of the parts to play nice together has been illusive.
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VENOMOUS1 RACING
Has Left the Room - Banned from VTCOA!
Have you ruled out a bad tune? Put it back stock? Adjusted Throttle valve cable? Just doesn't sound right for it to always have same issue. We have some of our builds with upwards of 70k miles and not even been into them for a filter! Lol
Here's a vid of one. Listen to the shifts
[ame]http://www.youtube.com/watch?v=9tIaLrDV9Xo&sns=em[/ame]
Here's a vid of one. Listen to the shifts
[ame]http://www.youtube.com/watch?v=9tIaLrDV9Xo&sns=em[/ame]
I have (9) tunes from (2) different tuners.
Cable adjustment is correct and has been tried at various tensions.
And I totally agree as do all the those involved in trying to repair it; It doesn't make sense to have the same issues.
The guy working on it next has 727s in use at the track for 15 years with no issues.
I hope mine works like the one in the video soon. It did 5 years ago before I upped the horsepower (again) and broke it.
It has never been the same since.
I'll keep working with it and eventually it will work like it should.
Thanks for the Input!
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canviper
Full Access Member
Hey Ronnie where did you find this tranny shop? Is it local.
Maybe the case and or valve body is warped. Happened to my AOD, valve body wouldn't seal and would cause problems.
NukeGM/Ford
Active Member
In all this time those shops didn't try to put in a completely different used trans to see if it does the same thing? ? Doesn't have to be rebuilt, just good enough to survive 5-600 miles. If it still does it then it would be a programming issue right? ? At least they could narrow it down some.
The latest shop is near Balzac. I can give you specifics if you need them.
It is def. something common to each build.
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