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post #1 of 20 (permalink) Old 02-23-2014, 11:54 AM Thread Starter
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j mod vs shift kit

I've been doing research and im trying to decide which is better. Should i go with the jmod or should i run to summit and get this shift kit. i replaced my rear end with a limited slip 3.73. Just wasn't some quicker firmer shifts any help would be greatly appreciated
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post #2 of 20 (permalink) Old 02-23-2014, 11:57 AM
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Hands down J-Mod is your best bet. See RobertP's web add in my sig or PM him he sells pre-made kits.

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post #3 of 20 (permalink) Old 02-23-2014, 12:00 PM
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J-mod is a shift kit - definately your best bet for shifting written by a former Ford transmission engineer. There are a few other kits available, depending on which one you are looking at from Summit .. the Transgo kit does some strange things like adding an external pressure relief valve which was not recommended by the author of the J-mod.
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post #4 of 20 (permalink) Old 02-23-2014, 12:01 PM
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The J-mod is a shift kit designed by one of the Ford engineers who designed the 4R70W. Hands down your best option.

-Brandon
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post #5 of 20 (permalink) Old 02-23-2014, 02:01 PM
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JMod x4.

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post #6 of 20 (permalink) Old 02-23-2014, 08:07 PM
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Yes jmod I've kits in stock

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post #7 of 20 (permalink) Old 02-23-2014, 09:05 PM
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Definitely J-mod....I mean, it was designed by the transmission engineer! lol

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post #8 of 20 (permalink) Old 02-23-2014, 10:26 PM
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J-Mod, end of discussion. Close this thread.
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post #9 of 20 (permalink) Old 02-24-2014, 12:54 AM
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Quote:
Originally Posted by RobertP View Post
Yes jmod I've kits in stock

Robert
RobertP How much does a jmod kit cost?

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post #10 of 20 (permalink) Old 02-24-2014, 08:49 AM
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110 delivered

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's ported manifolds
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post #11 of 20 (permalink) Old 03-20-2014, 09:11 AM
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I did some research on it and frankly I don't understand why people would trade extra trans wear and reduced power just to get "that signature slushbox feel"... can anything good be said about shift overlap?
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post #12 of 20 (permalink) Old 03-20-2014, 09:42 AM
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I have a feeling Ford's engineers determined the life expectancy on the unit with the amount of slip and wear experienced under normal driving conditions and found that it met or exceeded the target life expectancy of the vehicle or powertrain as a whole.

The MN12 was never marketed as a performance automobile to compete with the Mustang... It was marketed as a "Personal Luxury Coupe" - harsh shifts don't fit in with the term "Luxury" as one would see it from the factory.

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
98 Black Mark VIII 160k, stock daily driver
07 Redfire Fusion V6 SEL 178k, for the wife
Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII

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post #13 of 20 (permalink) Old 03-20-2014, 02:51 PM
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Quote:
Originally Posted by RobertP View Post
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Do you have one for a 1994 4R70W , and what is included , and also what else do you recommend that I replace while I'm in there ? Also I had a tune done last summer and this changed the shift points/quality , will I need a retune ?
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post #14 of 20 (permalink) Old 03-20-2014, 03:16 PM
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makes sense I guess, the T-bird is less like a big Mustang and more like a small Lincoln
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post #15 of 20 (permalink) Old 03-20-2014, 06:42 PM
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Yes I have the the 94 kits in stock it comes with accumulators both 1 and 2 and both valve body gaskets, the new springs for the 1-2 accumulator and a filter usually they come with the 96 and newer filter as I do recommend changing to. The newer style pan as it helps with fluid starvation and the trans should last a long time then

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's ported manifolds
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post #16 of 20 (permalink) Old 03-21-2014, 04:06 AM
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Sorry to waste your time Robert , I already have the majority of the parts listed. I must have misunderstood your web site , I thought that there might be a modified separator plate in the kit .I'm sure we'll get another chance to do business.
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post #17 of 20 (permalink) Old 03-21-2014, 07:26 AM
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Yes it does come with a modified seperator plate hence why I need the old plate back, I've posted this numerous times here on the forum, the only thing the kit is missing is fluid and tools

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's ported manifolds
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post #18 of 20 (permalink) Old 03-21-2014, 02:43 PM
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Quote:
Originally Posted by RobertP View Post
Yes it does come with a modified seperator plate hence why I need the old plate back, I've posted this numerous times here on the forum, the only thing the kit is missing is fluid and tools

Robert
Okay , I'll take one. How do we proceed ? I assume you need some details and maybe a little cash. The car is still put up for the winter and I won't be able to get it out for at least a month , I'm in the parts gathering stage right now. I did see someone selling one of your kits and making reference to sending you the removed separator plate , but that's the only time I've ever seen it mentioned.
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post #19 of 20 (permalink) Old 03-21-2014, 08:59 PM
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Ill pm u, sorry it's been a rough 2 weeks and ive had late nights working

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's ported manifolds
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post #20 of 20 (permalink) Old 03-23-2014, 07:09 PM
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Hey no problem Robert , been there. Plus my search technique's aren't that great.
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