Trans won't stay cool

Mark Kovalsky · Jul 15, 2016

TyCorr said:
From Ford? The bypass kit? I am having a trans built and while I have faith in the builder, i do also like to check things over.

I know Summit makes a kit. Ford probably has the parts, I don't know if they are packaged in a kit.

TyCorr said:
And are/were there lots of failures in regard to not having one?

I have no way of knowing. I do know that the people that kept track of that felt the need to spend the money to create the bypass for the 4R100.

kingbilly68 · Jul 15, 2016

What type of fluid should I use? Dex/merc? Merc v?

lincolnlocker · Jul 15, 2016

kingbilly68 said:
What type of fluid should I use? Dex/merc? Merc v?

merc v or better.

live life full throttle

god bless america and the farmer who feeds your fat ass

mandkole · Jul 15, 2016

TyCorr said:
And are/were there lots of failures in regard to not having one?

Like I said earlier, I specifically asked why mine was removed when mine was redone. I was directly told, 'they aren't worth the effort, especially around here (the NW)'. Jeff (My builder) would have put it back on, but said that he removes every single one that comes through his shop. He said, I'll support you if it breaks. For what ever its worth, I went with it. Cooling has never been an issue for me and I just run the V10 cooler.

Sonnax makes a kit that is said to deal with the issues of premature opening.

trackspeeder · Jul 15, 2016

TyCorr said:
From Ford? The bypass kit? I am having a trans built and while I have faith in the builder, i do also like to check things over.

Sonnax 4R100 bypass rebuild kit 36605-02K. They run about $20. bucks.

Mark Kovalsky · Jul 16, 2016

lincolnlocker said:
merc v or better.

What do you mean by better?

lincolnlocker · Jul 16, 2016

Mark Kovalsky said:
What do you mean by better?

not cheapy brands. more like special order stuff.. lubrication engineers and Schaeffers

live life full throttle

god bless america and the farmer who feeds your fat ass

Mark Kovalsky · Jul 16, 2016

It still needs to meet the MERCON V spec for it to work properly. Most of those do meet it.

TyCorr · Jul 18, 2016

mandkole said:
Like I said earlier, I specifically asked why mine was removed when mine was redone. I was directly told, 'they aren't worth the effort, especially around here (the NW)'. Jeff (My builder) would have put it back on, but said that he removes every single one that comes through his shop. He said, I'll support you if it breaks. For what ever its worth, I went with it. Cooling has never been an issue for me and I just run the V10 cooler.

I always ran the stocker and another small one. I only had a few times it got really hot. Lasted 250k miles. I just got the bigger 6l cooler last week for my new trans since im not interested in the anal-retentive approach it took to get my stocker to 250k miles

Sonnax makes a kit that is said to deal with the issues of premature opening.

Mark Kovalsky said:
I know Summit makes a kit. Ford probably has the parts, I don't know if they are packaged in a kit.

I have no way of knowing. I do know that the people that kept track of that felt the need to spend the money to create the bypass for the 4R100.

Ha ha, very true. I wondered if ford was able to define a failure rate for the device or for transmissions that didnt use them. It doesnt seem like it'd be a common failure but that doesnt mean it isnt.