Hemi 5.7 Transmission issue JSS - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 5 Old 09-22-2018, 03:02 PM Thread Starter
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Hemi 5.7 Transmission issue JSS

I have a jeep wrangle Auto Hemi 5.7- 2015. Swap was done by JSS Todd.
I have a couple problems but the main issue is the transmission. When I drive my Jeep on Auto mood, letís say Iím going up by the hill (dunes, soft sand) the car would shift by it self starting from 1-2-3-4-5 until it slows or stops where itís at because Iím on Auto mood but when itís on manual mood you would have the full control of shifting right. In my case thereís no difference weather Iím on Auto or Manual. I remember after the swap my Jeep when itís on manual mood I would have full control of it, it wonít even shift to second or third gear no matter how much the RPM is at, i could go up to whatever sand hill I want . But not anymore now once its reaches to almost 5 rpm it shifts right away to second and keeps going tell it stops. So Iíve talkin to Todd about this many many times I actually drove all the way to him From LA 3 times and coming back with with nothing about solving this issue. Last time we spoke he said ďWell i remember the transmission staying in gear in tap mode, but the transmission computer would over speed and it would go into the next gear has a fail safe. I think this would happen at 5000 RPM and i think the transmission has learned your driving habits and adapted to save it self. And I do not think this is a problem, i think this is going on so the transmission can last and so the engine does not over rev. You could have the transmission reprogrammed but that would void your warranty, because i want your conversion to last.Ē This what he says again leaving me with no solution. Another problem is that I only have one key for my Jeep I lost my spare keys, I had to buy new ones and program it but it did not work I tried in everywhere, the system blocks and it wonít let you access even Todd had no solution to IT. I have no Cruise control.


Please I need some suggestions, soon I'm going home to middle east and I'm taking my jeep with me. I really have to fix the transmission issue, i cannot off road like that at all, i can't even go at the dunes where itís all sand, my friends with their stocks Jeep are preforming better than me. Cant even drive up a baby hill cuz it shifts right away.
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post #2 of 5 Old 09-30-2018, 05:17 PM
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CARB LEGAL HEMI SWAP

So this is a good wright up, We build our Hemi swaps with a stock engine tune, now you can use HPTuners with our Engine conversions, if you want to change out the Cam, do headers, super charger. On our 2012-2018 Jeep JK Hemi conversions we do not change the trans tune, if the Jeep shifts good. We want to keep it stock on our end, so the engine and transmission will last. In this Jeep the transmission shifted very good and the engine runs great (mostly in drive), So when the transmission is in manual mode, after some high revs 5000 RPMs and over the transmission must have been trying to save it self. Because at first the rev limiter was higher in manual mode, so by it self the transmission lowered the rev limiter to a save setting. The engine is putting out 400HP and 425 Foot pounds of toque and the engine rev-limiter is set at 6200 RPMs. If you modify from stock i can not warranty engine and transmission parts. This Jeep runs great and has a lot of power! This Jeep could also have a stability problem or traction control, we have found the 2012-2018 Jeep have the brakes applied and the throttle reduced. All and all this Jeep worked out great and we save it from being totaled from being flooded.

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post #3 of 5 Old 12-13-2018, 06:30 AM
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The only CARB Legal V8 swap

Found the problem, transmission controller is bad. This Jeep at one time has gone under water and the transmission controller got wet. The nice thing about keeping your Jeep all Mopar is so easy to repair. Mopar or no Car !
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post #4 of 5 Old 12-17-2018, 05:06 PM
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Quote:
Originally Posted by jss View Post
Found the problem, transmission controller is bad. This Jeep at one time has gone under water and the transmission controller got wet. The nice thing about keeping your Jeep all Mopar is so easy to repair. Mopar or no Car !
That is good support Todd.

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post #5 of 5 Old 12-17-2018, 05:07 PM
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Quote:
Originally Posted by Baraa Z Als View Post
I have a jeep wrangle Auto Hemi 5.7- 2015. Swap was done by JSS Todd.
I have a couple problems but the main issue is the transmission. When I drive my Jeep on Auto mood, letís say Iím going up by the hill (dunes, soft sand) the car would shift by it self starting from 1-2-3-4-5 until it slows or stops where itís at because Iím on Auto mood but when itís on manual mood you would have the full control of shifting right. In my case thereís no difference weather Iím on Auto or Manual. I remember after the swap my Jeep when itís on manual mood I would have full control of it, it wonít even shift to second or third gear no matter how much the RPM is at, i could go up to whatever sand hill I want . But not anymore now once its reaches to almost 5 rpm it shifts right away to second and keeps going tell it stops. So Iíve talkin to Todd about this many many times I actually drove all the way to him From LA 3 times and coming back with with nothing about solving this issue. Last time we spoke he said ďWell i remember the transmission staying in gear in tap mode, but the transmission computer would over speed and it would go into the next gear has a fail safe. I think this would happen at 5000 RPM and i think the transmission has learned your driving habits and adapted to save it self. And I do not think this is a problem, i think this is going on so the transmission can last and so the engine does not over rev. You could have the transmission reprogrammed but that would void your warranty, because i want your conversion to last.Ē This what he says again leaving me with no solution. Another problem is that I only have one key for my Jeep I lost my spare keys, I had to buy new ones and program it but it did not work I tried in everywhere, the system blocks and it wonít let you access even Todd had no solution to IT. I have no Cruise control.


Please I need some suggestions, soon I'm going home to middle east and I'm taking my jeep with me. I really have to fix the transmission issue, i cannot off road like that at all, i can't even go at the dunes where itís all sand, my friends with their stocks Jeep are preforming better than me. Cant even drive up a baby hill cuz it shifts right away.
Todd is still working on getting functional cruise switches made.

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