Auto trans questions
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Junior User
Joined: Sep 2015
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From: Kitsap peninsula WA
The issue is probably that you're used to towing with the Duramax/Allison that had the Tow/Haul mode. This function changes the transmission shifting strategy to apply the torque converter clutch in 2nd gear and hold it through the remaining upshifts. The 4R100 (the associated strategies programmed in the PCM) has ALWAYS had terrible strategies for torque converter clutch apply and release points because there was never a dedicated "tow mode". Unfortunately the harshness police put the skids on any kind of torque converter clutch apply at light loads in 2nd gear so the only way to get it was to give her "the onion" but that only works as long as the shift strategy in question doesn't release the converter clutch on deceleration.
( I've never installed a tuner on any of my trucks but was going to install a hydra on this truck the same time I do gears and transmission. Is there any tuners that have written good strategies to help with the converter lockup?
The biggest issue though is that (when in conjunction with the programming shortfalls) the gear ratios in the 4R100 are absolute dog****. Compare the first three ratios of the 4R100 with the Allison and you'll find that the 4R100 pulls in 1st and 2nd just like the Allison would in 2nd and 3rd. Additionally the stall speed of the torque converter between the two is also worlds different.....the Ford has much more "slip" in the fluid coupling than the GM creating more heat.
( I've never installed a tuner on any of my trucks but was going to install a hydra on this truck the same time I do gears and transmission. Is there any tuners that have written good strategies to help with the converter lockup?
The biggest issue though is that (when in conjunction with the programming shortfalls) the gear ratios in the 4R100 are absolute dog****. Compare the first three ratios of the 4R100 with the Allison and you'll find that the 4R100 pulls in 1st and 2nd just like the Allison would in 2nd and 3rd. Additionally the stall speed of the torque converter between the two is also worlds different.....the Ford has much more "slip" in the fluid coupling than the GM creating more heat.
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Joined: May 2004
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From: Central Coast of CA
I'm running 37's on 18" wheels, 6" lift and 4.30 gears. The speedo is almost spot on (fractions off) and the 37/4.30 combo is extremely close to the same ratio as the stock 265/3.73 combo. You'll be happy with the 4.30's.
Stewart
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Joined: Sep 2015
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From: Kitsap peninsula WA
Thanks for the replies and info about the truck but back to my original question, "does anyone in western WA recommend a good transmission builder in the local area?" I'd prefer the builder to be in kitsap county or gig harbor area. I have to tow the truck to their location. I've got two quotes from local shops ( al's performance transmissions, and all about transmissions) the quotes were $1600 different and both promise to build a transmission as strong as anyone nationwide but their warranty is the standard 3year/36k /50k respectively. I would love to put in JW or BTS but time and builders current availability is the problem. I'm willing to gamble on a local guy if someone can recommend and have used one.
Thanks
Thanks
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Joined: May 2004
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From: Central Coast of CA
I completely disagree with the warrantee assertion regarding ATS.
Unless they changed it, their warrantee literature states something to the effect of you cannot modify your vehicle to produce more power, otherwise the warrantee is void.
I have talked to several people face-to-face (not on a forum) where they said ATS screwed them over on a warrantee for their transmission because they had a 38R, or in another instance upgraded injectors. These guys weren't driving high horsepower rigs either, just daily drivers like most of us that have been modified a bit for performance and power.
I had a couple guys at John Woods place told me the same thing, and that was how they found out about JW, because ATS refused to honor their warrantee.
The only people (two) I've talked to that have had ATS honor the warrantee on their transmission (and their rigs were modified), were guys that either had a connection to the owner of ATS, or they were friends with a shop that had close working ties with ATS. I met both of those guys at the track.
Stewart
Unless they changed it, their warrantee literature states something to the effect of you cannot modify your vehicle to produce more power, otherwise the warrantee is void.
I have talked to several people face-to-face (not on a forum) where they said ATS screwed them over on a warrantee for their transmission because they had a 38R, or in another instance upgraded injectors. These guys weren't driving high horsepower rigs either, just daily drivers like most of us that have been modified a bit for performance and power.
I had a couple guys at John Woods place told me the same thing, and that was how they found out about JW, because ATS refused to honor their warrantee.
The only people (two) I've talked to that have had ATS honor the warrantee on their transmission (and their rigs were modified), were guys that either had a connection to the owner of ATS, or they were friends with a shop that had close working ties with ATS. I met both of those guys at the track.
Stewart
Last edited by Stewart_H; Jul 16, 2017 at 04:54 PM.
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Junior User
Joined: Sep 2015
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From: Kitsap peninsula WA
I talked to a few more shops today but without any references and reviews i'm not 100% positive on any of the local transmission builders abilities to build a rock solid 4r100. Needless to say I was able to finally get ahold of BTS and thats the direction I'm going. If all the stars line up I should have my new transmission early august, then I'll have the new gears installed.
Thanks for the advice and information
Thanks for the advice and information
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Junior User
Joined: Sep 2015
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From: Kitsap peninsula WA
thanks, after doing research i thought 4.30 and 37" tires were close to the original ratio. surprisingly the one local shop I talked to tried to talk me out of 4.30's and into 4.11's or 4.56's. he said 4.30's were a ******* gear? nonetheless, I finally talked to the most recommended gear guy in the area and not only was he $1000 cheaper than most of the bids I got, he said 4.30's were not a problem and is what he recommended too.
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