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1990 transmissions are weak?

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94cyclone

15+ Year Contributor
73
0
Dec 19, 2007
rockford, Illinois
I got the following email from Jacks Transmissions:
Hello,

We have inspected your transmission and I'm afraid I have some bad news.

This is an early 1G transmission and all of the parts are very small and weak. Most of the special upgrades that are included with our Premium transmission rebuild will not fit in this unit; even if they would the transmission would still be very likely to break under high horsepower. The Quaife LSD, however, would still fit in the transmission.

There are two options.

1. We can do an OEM rebuild plus the Quaife on this transmission. We would refund $200 of your payment. We could still have it shipped by the 24th. We don't recommend this option, since you would still end up with the tiny, weak gears, and we can't warranty a rebuild done on this transmission.

2. We can find a later 1G transmission for you with the stronger components. We would need an additional $300 to pay for the core. It will bolt right in and be a much stronger, better unit with all of our Premium upgrades including the Quaife LSD. The main problem is I have no idea how long it will take for us to find a proper core (if you can send us one, that would be ideal.)

How do you guys feel about what he is saying? What are your recommendations? The trans is a 1990 fwd. The motor is a 1990 turbo :confused::confused:jdm cyclone. The ecu is jdm. The body is at 1994 gs.
 
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The 1990 transmissions are internally weaker and they are only single synchroed for some of the gears, I think 1st and 2nd , I suggest that if you are looking for more than 300 wheel horsepower then upgrade to a later 93-94 tranny.
 
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He is 100% correct and knows what he is talking about, ive known him for years and a good guy. I would try to find a later tranny core at a junkyard and send it too him.
 
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I think you'll be fine on just a stock rebuild no need for dbl syncros on a 400hp below motor, as long as your not side stepping the clutch.

90's are a lil weaker but it will be fine no need in spending extra $$ on something that doesnt need to be done.
 
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I would get it done. Jack does quality work and would not b.s. you. Your car isn't stock, so what's the point of going back to a stock tranny, when you could get one built with a 3 year warranty. The last thing I have to worry about in my car is my tranny because A. Jack built it, and B. It's under warranty. :D
 
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Anthony, I have been looking hard core for you about this transmission. But 90s are different and a real pain in the butt as far as splines and small stuff like that.

Look on the bright side I now know my 14b which you sold me is off a 90 jdm gallant ROFL
 
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No, I thought it was too, I picked it up without looking because he knows his stuff and is a good buddy so I didn't even look. Got home and saw straight fins and not stagared(sp) it is a 14b based on the numbers I looked up from the compressor housing.
 
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you would probably be fine with a stock rebuild of your tranny if: a.) you don't launch with slicks on b.) you don't wheel hop with high hp.


ifrc 93-94 have larger axles, which would be good for a high hp car, however, you cannot do a equal length half-shaft mod with that tranny.
 
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I am not a transmission expert but from what I have been trying to find out the 90 transmission is not as good as the others but it can be made to work just fine. Example is I am talking with sheptrans.com and they know I have a 90 transmission and are more than willing to do the work I am asking for but it will cost a little bit more than if I had a 93 transmission.

I am over 300awhp and have not broken a stock 90 transmission with 256k on it right now. I daily drive the car and have taken it to the track. Your driving habits will be the biggest thing that kills your transmission if anything does it. I am in the process of trying to get the car to 500awhp and am not going to do anything to the transmission in the mean time. It will go one day but I am going to just wait till it does.

Good luck.
 
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I have heard that the 91 has the strongest gears, late 92-94 have double syncro'd gears (can't remember which besides 2nd) and the best way to go is 91 tranny with 92 dual syncros. This is for keeping the tranny stock of course.
 
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single syncros suck! iv had 2 91 lasers that were stock that had problems with them both under 100k if your going to do it do it right. what good is hp if you cant put it to the ground
 
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Hey thanks guys! I ended up buying a used 93 trans from a fellow forum member. It should arrive at Jacks on Monday! I'll let you know how the install goes. When I went to buy new axles from statracing.com they show the same part number for 1988 - 1994? Anyways, so I bought a new passenger side because I won the battle against my wheel nut, but lost the war because I had to use my angle grinder and f'd up the threads.

I appreciate all the replies!

Hey Joe, sorry about that small 16 turning out to be a 14b! Free tool borrowing for you for a lifetime should cover it hu?
 
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quick question, i have 92 awd, almost all stock adn Im starting to build the car for a goal of 300-350 whp. now i had tranny rebuilt last year had them replace any parts that were worn or broken. should i be ok with a stock tranny for a couple of years after i reach my goal of should my second investment( i need to rebuild my engine dropped two valves) be my transmission?
Thanks

Pete
 
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switch tranny.. end of story.. they will bust as you get up in power, and our tranny's are already not the most robust in the world.. save yourself the money and do it right.. you are going to have it rebuilt, then break it, and probably go this route anyway
 
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From my understanding the linkage in the 90's is also different from the 91-94. So there would have to be some changes made in the car to get the right linkage to work. I would also bring that up with Jack it may not be that big of a deal but could help you make a more informed decsion.
 
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The drama continues here is the latest email from Jacks Transmissions:
www.jackstransmissions.com
------------------------------------------------------
Order Number: 78
Detailed Invoice: /account_history_info.php?order_id=78
Date Ordered: Monday 07 April, 2008

Hello,

You're not going to believe this, but I'm afraid someone has tried to pull a fast one on you.

The transmission you sent, the one that was supposed to be the 92, is actually another early 90. It has the small weak parts that came with your first transmission.

This must be really annoying for you; I'm sorry it's not going more smoothly. Please let me know what you would like to do.

Thanks,

Jon
www.jackstransmissions.com

Your order has been updated to the following status.

New status: On Hold

Please reply to this email if you have any questions.

And the response from Ducky:
I think you need to go to the tranny shop and take a look your self. The reason I say this is because I know for a fact that that tranny that I sent came out of a 1994 Eclipse that I bought for my son in 1994 I still have the car it came out of in my garage.

Does anyone have any experience with Ducky? From what I've heard so far Jack seems to be a good guy, can anyone vouch for Ducky's character?

Any advice where to go from here?
 
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I am not sure if this is correct with our aged cars but on new cars they stamp the VIN into alot of the parts (motor,tranny, etc) If they did stamp the VIN into the tranny you might be able to do a search to find out what year it came out of.

Best of luck.
 
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phirn said:
quick question, i have 92 awd, almost all stock adn Im starting to build the car for a goal of 300-350 whp. now i had tranny rebuilt last year had them replace any parts that were worn or broken. should i be ok with a stock tranny for a couple of years after i reach my goal of should my second investment( i need to rebuild my engine dropped two valves) be my transmission?
Thanks

Pete
Click to expand...

Everyone has different opinions on this but mine has lasted for almost 2 years with the car at 300awhp. Keep in mine the car has 255k on the odometer and I can not say for sure if it is the original tranny but I think it is.
 
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Just check for a vin # on the tranny and look at the 10th digit. If it's a 94' it should be a R. Also I have a 90' trans in my car and it is holding just fine. As long as you don't abuse the tranny (high rpm launches droping the cluch, banging the gears it will be fine)
 
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