Transmission problems

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Oct 20, 2022 | 06:09 PM

Vinnie22

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3rd Gear

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Transmission problems

Hello I have a 99 f350 dually. Trying to figure what trans I have. And if I’m supposed to be running about 2600 rpm at 70 mph.

Oct 20, 2022 | 06:58 PM

Walleye Hunter

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From: Douglassville, PA

Automatic would be a 4R100 manual would be a ZF6. RPMs at a given speed would be dependent on what rear is in it but I don't know what gears would yield what RPMs

Oct 20, 2022 | 07:02 PM

ESwift

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That is fairly close to stock tire size and 4.88 gearing. Is it a cab and chassis truck? I dont think 4.88 was standard on a 350 with a 7.3, but maybe was an option on the cab and chassis model

Oct 20, 2022 | 07:07 PM

Walleye Hunter

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From: Douglassville, PA

Quote:

Originally Posted by ESwift

That is fairly close to stock tire size and 4.88 gearing. Is it a cab and chassis truck? I dont think 4.88 was standard on a 350 with a 7.3, but maybe was an option on the cab and chassis model

Are all duallies chassis trucks?

Oct 20, 2022 | 07:13 PM

ESwift

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Quote:

Originally Posted by Walleye Hunter

Are all duallies chassis trucks?

not on a f350. Some are standard frame trucks with a dually axle, and some are narrow frame cab and chassis design

Oct 20, 2022 | 07:29 PM

Vinnie22

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3rd Gear

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The tag on the rear end says 4.10. And it has a dually bed not cab and chassis. And that is an only a 4 speed no over drive. Just trying to figure it out

Oct 20, 2022 | 07:35 PM

Walleye Hunter

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From: Douglassville, PA

4th is OD and some duallies were put on chassis trucks and have different frames.

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Oct 20, 2022 | 11:21 PM

Vinnie22

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3rd Gear

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235 16. And at 70 it runs about 2700. And the light blinks sometimes.

Oct 21, 2022 | 07:06 AM

#10

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

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From: SE Florida

Quote:

Originally Posted by Vinnie22

The tag on the rear end says 4.10. And it has a dually bed not cab and chassis. And that is an only a 4 speed no over drive. Just trying to figure it out

If you have a four speed without overdrive you have some custom transmission that has been fitted. Ford only offered the 4R100 four speed overdrive (four forward ratios, the highest one being 0.71:1 overdrive) or a six speed manual transmission. Those were the only two choices. There were no four speed non overdrive transmissions.