01 Tranny Diode
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Elder User
Joined: Oct 2007
Posts: 672
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From: NJ
01 Tranny Diode
Hi all,
I have an 01 f350 (in sig) and I'm wondering if I have the "bad" tranny diode. Oh, what is the tranny diode, and what does it do? I want to know how sound my tranny is before I get a tuner. Are there any other good tests to check the soundness of a transmission?
Thanks
I have an 01 f350 (in sig) and I'm wondering if I have the "bad" tranny diode. Oh, what is the tranny diode, and what does it do? I want to know how sound my tranny is before I get a tuner. Are there any other good tests to check the soundness of a transmission?
Thanks
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
You need to find the build date of the truck or tranny to know if you have the mechanical diode. There's a good chance you do with the 01. Several people here have the mechanical diode and run a chip in their truck. Installing a shift kit or valve body will help prolong the life of the tranny, but there's no check for the soundness of the diode. It will either work great or fail and make you get a new tranny.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Jack, I don't know about the bad tranny. I have what I have in my sig and more. My tranny is doing good so far. I don't know what the hoop low is all about. I guess we will find out soon enough.
We do have the Diode trans.
We do have the Diode trans.
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Elder User
Joined: Oct 2007
Posts: 672
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From: NJ
Hi Rick,I guess I'm just worried about getting a tuner and blowing something up. If I paid for a tuner, then had to pay for a new tranny just because I got a tuner (mainly for kicks) I would kick myself so hard I wouldn't be able to go to sit on the toilet for a week.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Well Jack, if I blow my trans up, I will get another. What else can I do? Can't let the truck sit. I will get a BTS when I start getting signs of my trans going out. Untill then, I will run this one to the max.
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
So tweak your trans first to help it live longer. Extra cooling and a shift kit/VB will help it out.
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Post Fiend
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Joined: Aug 1999
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From: SE Florida
The biggest difference is that the mechanical diodes used in the 4R100s failed MUCH more often than the sprag clutch that it replaced.
Here's what a mechanical diode looks like:
Epilogics Mechanical Diode Website Homepage
I don't know exactly what was wrong with the ones used in the 4R100. They were successfully used in transmissions before and after the 4R100.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Here's what a mechanical diode looks like:
Epilogics Mechanical Diode Website Homepage
I don't know exactly what was wrong with the ones used in the 4R100. They were successfully used in transmissions before and after the 4R100.
Epilogics Mechanical Diode Website Homepage
I don't know exactly what was wrong with the ones used in the 4R100. They were successfully used in transmissions before and after the 4R100.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
Initially, it was discovered that high rpm was the killer of the "diode". That's why they pulled it from only the gas trucks produced. Unless there was a failure in the diesels, it was not replaced. Unless you rev your diesel way beyond the stock rev limits, due to a chip or tuner, rpm shoud not be a killer of the "diode". Like any part, it can still fail due to fatigue or defect. I don't think you should worry about the "diode" too much. I replaced mine, during my rebuild, as an upgrade and not because of failure with 128k miles. It was still functioning normally at the time and had no signs of future failure.
Butt-Head
Joined: Apr 2004
Posts: 9,457
Likes: 2,938
From: Reed Point, MT
74baja,
If you're worried, then don't do it. However, you are really missing out if you don't get upgraded programming.
I pull a 30' steel 6-horse trailer with mine. I ran DP-Tuner tuning (now my own) for almost 3 years. I have the dreaded "mechanical diode". As long as you're cognizant to the fact that the 1-2 shift is what kills the part, you can get a feel for when your truck will shift and then let up on the "go" pedal slightly to keep stresses down during the shift. 3300 RPM 1-2 shifts under full power aren't good. However, once you're in second, LET HER RIP!
If you're worried, then don't do it. However, you are really missing out if you don't get upgraded programming.
I pull a 30' steel 6-horse trailer with mine. I ran DP-Tuner tuning (now my own) for almost 3 years. I have the dreaded "mechanical diode". As long as you're cognizant to the fact that the 1-2 shift is what kills the part, you can get a feel for when your truck will shift and then let up on the "go" pedal slightly to keep stresses down during the shift. 3300 RPM 1-2 shifts under full power aren't good. However, once you're in second, LET HER RIP!
Posting Guru
Joined: Sep 2007
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From: Knoxville, TN
