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Old 04-15-2007, 09:21 AM
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99 Tranny question

Hello

I am new to the forum and this is my first post. I just purchased a 99 crew cab f250 4x4 with the 7.3 in it. It has an automatic tranny. The truck is stock and there are no problems with the tranny now, however I am looking at doing some enging mods and either a 6 or 8" lift kit with 36" tires. I was wondering if anyone could tell me some common problems with this tranny and how much power it could handle. I want to upgrade anything now before I do anything else to the truck so that I dont have issues come up on the future because of it. Will my stock tranny handle the lift kit and tires? Do I need to look at an upgraded torque converter? I just want to do it right the 1st time and not pay for my mistakes later. The truck and tranny have 76k miles. Thanks for all the help in advance.

Adam
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Old 04-15-2007, 09:28 AM
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Originally Posted by awrob27 View Post
Hello

I am new to the forum and this is my first post. I just purchased a 99 crew cab f250 4x4 with the 7.3 in it. It has an automatic tranny. The truck is stock and there are no problems with the tranny now, however I am looking at doing some enging mods and either a 6 or 8" lift kit with 36" tires. I was wondering if anyone could tell me some common problems with this tranny and how much power it could handle. I want to upgrade anything now before I do anything else to the truck so that I dont have issues come up on the future because of it. Will my stock tranny handle the lift kit and tires? Do I need to look at an upgraded torque converter? I just want to do it right the 1st time and not pay for my mistakes later. The truck and tranny have 76k miles. Thanks for all the help in advance.

Adam
In my opinion if it ain't broke don't mess with it. I understand your concern for upgrading and making the truck strong so it won't break. But to be honest if you upgrade the torq converter you might as well go through the whole tranny and upgrade everything. The torq converter you should use is a triple disc, upgrade the clutches and plates in the tranny, upgrade the valve body as well with heavier springs so you have firmer shifts and higher line pressure which will help keep the clutches hold better under load. Which means they won't slip as easily.

As for your stock tranny holding up to the lift and bigger tires. It will but for how long who knows. Most tranny problems are caused by the tc slipping. Which then contaminates the fluid which then ruins the rest of the tranny.

I am on tranny #3 in my truck, this time I did it right. Cost is about 2,500 bucks. So you make the decission.
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Old 04-15-2007, 10:55 AM
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What, do you mean you did it right? What were the changes you made to make this tranny better?

Thanks
Shawn
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Old 04-15-2007, 10:58 AM
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Originally Posted by dieselman77 View Post
What, do you mean you did it right? What were the changes you made to make this tranny better?

Thanks
Shawn
Well after my 2 attempts at rebuilding just replacing all the internals with oem parts, I had the tranny rebuilt with all sun coast parts and sun coast triple disc tc. As well a shift kit installed. My tranny problems are gone.
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Old 04-15-2007, 12:27 PM
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IC, suncoast stuff is top of the line.
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