J-modded slipping out of gear on HARD 1-2 Shift - TCCoA Forums
 
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post #1 of 13 (permalink) Old 04-14-2010, 09:48 PM Thread Starter
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J-modded slipping out of gear on HARD 1-2 Shift

I really enjoy my jmodded trans, just as much as the next guy.

However now on a hard launch and the consequent 1-2 shift the car slips out of all gears puts no power down and the engine revs to the heavens.

Im thinking that I might just rebuild it but I dont want to go through all the trouble if it's something smaller.

Car has ~175K on the original trans, fluid is clean and full, J-mod has two springs on the new design 1-2 accumulator and 1 on the 2-3.

1997 Thunderbird LX, 4.6L, Performance White.
3.27 TL, 300hp J-Mod, Mid-Mount Magnaflow w/2.25" True Duals to 3" Magnaflow 15* Slash Cut Tips, PI Intake,
FR500 Steering Wheel, FRPP Wires, 180* T-Stat, 22C Plugs, Cobra Vert Rears, RSTB, SC "L" Braces. 175k and still flying!

Last edited by greencurse; 04-15-2010 at 03:11 AM.
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post #2 of 13 (permalink) Old 04-14-2010, 09:56 PM
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Quote:
Originally Posted by greencurse View Post
I really enjoy my jmodded trans, just as much as the next guy.

However now on a hard launch and the consequent 1-2 shift the car slips out of all gears puts no power down and the engine revs to the heavens.

Im thinking that I might just rebuild it but I dont want to go through all the trouble if it's something smaller.

Car has ~175K on the original trans, fluid is clean and full, J-mod has one spring on the new design 1-2 accumulator and 2 on the 2-3.
You put 1 spring on the 1-2 accumulator piston and 2 springs on the 2-3 accumulator piston?
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post #3 of 13 (permalink) Old 04-14-2010, 09:58 PM
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It should be 1 or 2 springs on the 1-2 and none on the 2-3.
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post #4 of 13 (permalink) Old 04-14-2010, 09:59 PM Thread Starter
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Unless I got it backwards... its been fine for three years its just recently been acting up

1997 Thunderbird LX, 4.6L, Performance White.
3.27 TL, 300hp J-Mod, Mid-Mount Magnaflow w/2.25" True Duals to 3" Magnaflow 15* Slash Cut Tips, PI Intake,
FR500 Steering Wheel, FRPP Wires, 180* T-Stat, 22C Plugs, Cobra Vert Rears, RSTB, SC "L" Braces. 175k and still flying!
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post #5 of 13 (permalink) Old 04-14-2010, 10:08 PM
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Oh, you failed to mention you did the j-mod 3 years ago. Yeh, if you put 1 and 2 springs back in, it had to be 2 springs one 1-2 (one on top, one on bottom), and 1 spring on 2-3 (one on top).

Regardless, back to your original problem. I had that problem when I first did my j-mod except it didn't happen at WOT, but at 1/2 to 3/4 throttle. The car would act like it shifted to 2nd for just an instant, then pop out like it went to neutral. I just kind of ignored it because it didn't happen all the time and it seemed to have went away by itself.

In your case (as I was told could be my problem by some here), the lack of a mechanical diode was known to be weak area in pre-98 transmissions. Sounds like that is your problem, but I'm no expert by any means.

You'll hear from some more experienced here shortly, I'm sure. Good luck!
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post #6 of 13 (permalink) Old 04-14-2010, 11:03 PM
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One way clutch Is gone will it go into the limiter on the 1-2 if u don't let out of it?

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post #7 of 13 (permalink) Old 04-14-2010, 11:09 PM
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Yep Clutch = Gone. With that many miles it might be time for a rebuild.

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post #8 of 13 (permalink) Old 04-15-2010, 03:09 AM Thread Starter
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Quote:
Originally Posted by RobertP View Post
One way clutch Is gone will it go into the limiter on the 1-2 if u don't let out of it?
damn skippy. thats the ticket... Good thing I have a week off coming up soon.

1997 Thunderbird LX, 4.6L, Performance White.
3.27 TL, 300hp J-Mod, Mid-Mount Magnaflow w/2.25" True Duals to 3" Magnaflow 15* Slash Cut Tips, PI Intake,
FR500 Steering Wheel, FRPP Wires, 180* T-Stat, 22C Plugs, Cobra Vert Rears, RSTB, SC "L" Braces. 175k and still flying!
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post #9 of 13 (permalink) Old 04-15-2010, 03:17 AM Thread Starter
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also while i have everyones attention, what brand should I go with for the rebuild kit? and what other parts besides the converter will i need not included in a kit

1997 Thunderbird LX, 4.6L, Performance White.
3.27 TL, 300hp J-Mod, Mid-Mount Magnaflow w/2.25" True Duals to 3" Magnaflow 15* Slash Cut Tips, PI Intake,
FR500 Steering Wheel, FRPP Wires, 180* T-Stat, 22C Plugs, Cobra Vert Rears, RSTB, SC "L" Braces. 175k and still flying!
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post #10 of 13 (permalink) Old 04-15-2010, 09:12 AM
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I use transtar kits, either a new overdrive band or the heavyduty one if it's just a basic rebuild

Robert

www.robstireandauto.com for all your car needs and parts
95 bird corn powered 735rwhp and 580 tq
86 bird vortech s trim
10.75 @128.38
95 bird - Vortech t trim
9.98 worlds fastest IRS 4.6 thunderbird
1/8 [email protected]
10.11 @ 139.19 best mph
1.47 best 60ft if I can get a full pass with this 60ftt
All made possible with Braincoating'ôs ported manifolds
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post #11 of 13 (permalink) Old 04-15-2010, 09:37 AM
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Instead of a rebuild i bet you could find a cheap low mile 4R from a junkyard.

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post #12 of 13 (permalink) Old 04-15-2010, 12:40 PM Thread Starter
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I think i can do it my self and just get a $200 kit, I just dont want to pull it or put it back in, but I will to save $1100-$1500. I guess im going to do a marauder converter and mark viii flexplate while its out.

1997 Thunderbird LX, 4.6L, Performance White.
3.27 TL, 300hp J-Mod, Mid-Mount Magnaflow w/2.25" True Duals to 3" Magnaflow 15* Slash Cut Tips, PI Intake,
FR500 Steering Wheel, FRPP Wires, 180* T-Stat, 22C Plugs, Cobra Vert Rears, RSTB, SC "L" Braces. 175k and still flying!
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post #13 of 13 (permalink) Old 05-01-2010, 10:03 AM
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Did you ever get a converter for this? I have one for a Marauder if you are interested.

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