Need some help on Id of 4t60 Tranny

[SleeperRed90TGp]

I have been doing a lot of research in the last year on our trannys and have come up with quite a few parts that will allow us to abuse them with out (possibly )failing. Clutches, bands. sprag units, roller clutches with more excentrix and wider to grab better. Stiffer springs in different places, biger clutch drums to hold more clutches and so on.

 

What I need is the info off the tags on the tranny. All would be helpful but the main thing is the model #. I can use all the input I can get as 1989 and 1990 seem to have different parts. Don't know exactly what yet but with your help I'll find out. i have a couple of pretty good contacts that are helping me throu this.

 

Yea I know you have to get under your car with a rag and a flashlight. But I'll share what I come up with.

 

Here is the location and the tag. If you can fill in the blanks I would appreciat it. Belevie me, what I can find out won't be a secret.

 

 

If your tranny has been rebuilt your tag may be blank do to the info is silkscrened on and after hot tanking the case its wiped out. Thanks GM.

 

 

 

Thanks

 

Jud

[TGPilot]

I will be under the car tomorrow for an oil change...if the info is there I will get it for you! 8)

[futuretgper]

don't mean to sound like a dick...but can't u look at ur own tranny???? don't u have one or why do u need others numbers?? u loose the info off urs mabey??

[herb427sc]

This is off the tranny I got from Davis (Invasion1)

 

Top to bottom---610 YR W12VW--Between the R and W there

was a rivet to fasten to the Tranny.

 

Large letters----YR

[SleeperRed90TGp]

don't mean to sound like a dick...but can't u look at ur own tranny???? don't u have one or why do u need others numbers?? u loose the info off urs mabey??[/quote

 

You are a dick. Your just showing your ignorance. I'll bet most of the trannys out there that have been rebuilt have blank tags. The info is not stamped on it's a lousy silkscreen.

 

Next time read the whole thread before you respond.

 

Now get out there and look at your tag. I doubt yours has been rebuilt.

 

Jud

[SleeperRed90TGp]

This is off the tranny I got from Davis (Invasion1)

 

Top to bottom---610 YR W12VW--Between the R and W there

was a rivet to fasten to the Tranny.

 

Large letters----YR

 

Thanks.

 

Underneath the YR was there an H. If yours is a YRH its the highest letter designation I have heard of. What year tranny?

 

There are over 20 models alone in 1990. Wonder how many in 89.

 

Jud

[Jeff M]

So I will quote this again

 

OLAH, OYLH and OLCH, god that sucks I know these off the top of my head

 

That info is based on working with these trannies since 1990 8) So you are not going to find any designation other than those, but fun to confirm this if you want

 

Jeff M

[futuretgper]

don't mean to sound like a dick...but can't u look at ur own tranny???? don't u have one or why do u need others numbers?? u loose the info off urs mabey??

 

You are a dick. Your just showing your ignorance. I'll bet most of the trannys out there that have been rebuilt have blank tags. The info is not stamped on it's a lousy silkscreen.

 

Next time read the whole thread before you respond.

 

Now get out there and look at your tag. I doubt yours has been rebuit.

 

dude gimme a break...haha what up ur ass...i did read your thread u never said specifically that your numbers were gone...i didn't know if you had a manual or you car was in storage and you were just looking for confirmation to get back to work i was just curious so i asked...so i really wasn't being a dick or ignorant...so why would you get so defensive....sorry if you took it that way man i never meant to insult you!!

[Jeff M]

Ahh, it happens, good come around 8) There are 3 specific TGP/TSTE trannies, the first one in 1989 got some updates for 1990 that brought on a harsh downshift at light throttle, and GM's fix was....a new tranny .And why I liked that was I was still under warranty and running 12 psi all the time having too much fun, knew the tranny would give it up and it did from doing high speed runs on empty highways taking trips up north.

 

Jeff M

[SleeperRed90TGp]

Thanks Jeff I got it the first time. Just wondering if the higher the letter the later the trans like the yr that herb has. That's not even in my manual. Now I would like to figure out the differences between the models. That's proly impossible.

 

 

Jud

[Jeff M]

Should be the OLAH (that shifted harshly) then OYRH (that “YR†version quoted) to replace that. There was a short run (TGP sales dropped off quickly in 90) that were OYAH and OLCH. GM is notorious for dropping parts so the latest might not be the OLCH but instead the OYAH. There was a different version maybe not indicated (OxxH?), in very early 89 MY where you had 4th gear at WOT, that was quickly found to not work/failed, being 4th had only one clutch and one steel. But if someone needs 4th gear to finish the quarter mile, they would have the fastest ets of anyone big time….128mph in the quarter is flying!!!

 

As for the many differences within these model lines, there are quite a few books that if you found all of them and bought them, and cross-referenced everything of importance, then "most" of the differences could be worked out, but then spend too much and find more differences in some obscure books (that happened to me), or help some guy out a ton that is so thankful he tells you more tranny info since you find out then, he worked/works for turbohydromatic and/or McLaren. Then of course those are the indicated differences, there is always more found in the field/actual, a humbling process getting to the bottom line! I would never like to work trannies only/for a living, always a huge challenge especially when trying to reinvent the wheel (make them better).

 

Jeff M

[SleeperRed90TGp]

Thanks again Jeff. From your last two paragraphs you have confirmed my suspisions. There isn't alot of rime to reason for all the model changes other than to fix problems. Man they had alot of problems

 

Not to worried about 4th gear. This car will never get out of 3rd in the 1/4. I did see where some models have 2 4th gear clutches and only one of the ones you mentioned (OLCH) has the 2. Looks like some expensive parts to change to 2 unless the 2 will fit in the same housing. Maybe with a thinner steel.

Jud

[Jeff M]

You are welcome! It did get some changes, to address areas to make them less complicated for manufacturing and service and repairs, it’s been going on to this (and all trannies actually) 4T60 as it progressed into the 4T60e and 4T65e/HD. But the most work was done back when this tranny was changed from its original 440T4 designation to the 4T60. Before that when there was the 440T4 back around 1987 the service trade hated this version with a passion, repair it and it comes back over and over. Typical for GM in all they do, corrections were slow to be acknowledged (that massive ego they have!!), then for them to look into it and do a fix? So that just made it better for the aftermarket though it took them a ton of time and money to figure out and test the corrections that they got to sell. It got better along the years up until the 4T60 came out where GM’s Turbohydomatic Division/THD did a full-out overhaul of the design, doing a pretty damn good job (after more than 10 years of it not being so good as the 440T4). There were still some corrections and revisions but these were not drastic and the 4T60 could at least then be made to last, and behind some much more power engines than back in the times of the 440T4. Actually we have the best 4T60 of all time, our little TGP/TSTE camp of cars were to be the guinea pigs to see if THD could make this tranny last behind some big power looking to come out a few years later in the Cadillac Allante with the Northstar. So even though we are all driving guinea pig/proto-type trannies we did get some awesome goodies out of this, parts that many of the fastest 4T65e and HD GTPs/Regals want but only a few know of. Of course for Caddy they wanted the name changed so the 4T60 became the F7 when installed in the Caddy with the Northstar, with only a little change to a seal and gasket is all over our tranny, shows it delivered the goods as originally designed/tested in our cars! I remember the many different shops I have worked with that when they took this TGP tranny apart and said, WTF?!?!...how come this tranny already came with all this stuff/upgrades?? A few were disappointed because they had over the years come up with a few upgrades that they were going to add but come to find out, it already came with this tranny stock, nice to hear these replies as well, a little confirmation to those ideas shared by both. As you found, there are some areas from the 4T60e-on that can be retro back into ours, having to know what it would take to mod those in this tranny and what to change and most key of all, any updates those later parts came with and will those same updates be proper when retrofitting back into an older tranny….see this is why I said I would not like to do trannies for a living, I would love all the challenges but not stuck in just one field/trannies, I like too many things to want to be just into trannies, it was just enough fun for me looking to get really good at this one tranny line and I am ready for something else! Another great area addressed with these FWD trannies is the problem others had with lane changing torque steer, or power steer I should call it to differentiate it, but I enjoy taking a TGP (not very often) and roasting the tires with my hands just off the wheel while it pulls straight and true, amazing!! Going around a corner under power and you feel the tires trying to straighten out but I can live with that not having it change lanes when I am doing a power take-off from a stop! Also its nice to have our Aux Tranny Cooler sitting in the fender cavity with an air supply duct running to it, it does a great job, and a good place to order up and get a larger one if someone wants to do more upgrades, but from temperature tests I have run in hot summer months the tranny fluid had to be beat repeatedly to get the temps to rise above 190, not bad, but this was a good tranny with fresh fluid and filter, not something with a, old restricted filter, old fluid, plugged radiator and a possible slipping clutch pack.

 

So that’s enough info, I got work to do, though not on trannies today

 

Jeff M

[herb427sc]

Got all the numbers:

 

6 117

1 2 A

0 0 3

Y

R

H Y

 

W R

1

2

V

W