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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1973-1991 Ford F150



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  #1  
Old April 12th, 2012, 08:39 PM
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Default 1988 f150 t 18

I just had a guy order me in a rebuilt transmission and I wanted to double check gear ratios before it was final. The guy says it has a first of 4.38:1, but everywhere i've found online says it should have a 6.32:1 ratio for first. He says the 4.38 is the more common and the other does exist. I just want to make sure i'm getting the right thing and not gonna lose my granny gear. Any thoughts?
  #2  
Old April 12th, 2012, 08:43 PM
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Could be based upon year, I know for certain, the T-18 was offered with 2 different 1st gear ratio's, the Np435 has a 6.69:1 first ratio that might also be something to consider.
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Old April 12th, 2012, 08:50 PM
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That's true, all I know is when it's in first or reverse it's slow hah. And I'd like to keep it that way. It's my only rig so I cant afford much downtime. Id like to stay the same cause it works and I'd like ease of installation.
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Old April 12th, 2012, 08:53 PM
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Let me see what I can dig up.
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Old April 12th, 2012, 09:01 PM
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One site info:

The standard Borg-Warner T18 transmission has a length of 11.87 inches, a total height of 17.5 inches, and a total weight of 145 lbs. The T18 is cased in cast-iron. The top cover is also cast-iron. The PTO port is located on the passenger side of the vehicle. The T18 has gearing ratios of 6.32, 3.09, 1.69, 1.0 and R7.44. There are slight variations in the length of Ford T18 and Jeep T18 transmissions.

All the site's I've checked show the T-18 having 6.32:1 ratio
  #6  
Old April 12th, 2012, 09:16 PM
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"A certainly rare version of the Ford T18 was the T18B, as provided in diesel trucks from 1967-1972, featuring higher gear ratios in 1st thru 3rd gears (4.32, 2.26, 1.51). This transmission will be very rarely encountered, but individuals should be aware of the possiblity. "
Now that isn't the 4.38 like you said, but it's close. It also doesn't make sense consider your f150 isn't diesel and the only diesel of the 67-72 years would be in biggg trucks.

"The T19 had a fully synchronized first gear and was available with a 6.32:1 first gear as you mentioned but were used primarily in the Ford 500-800 series Heavy Duty trucks. The most common T19 available in Ford diesel applications was the T19A with the 4:02:1 first gear ratio. Also in 1983-1984 there was a Ford T19 with a 5.1:1 first gear.

Ratios:
4.02,2.41,1.41,1.00
5.11,3.03,1.79,1.00
6.32,3.09,1.68,1.00

If it's out of the truck it's easy to shift your transmission into first gear and rotate the input shaft while counting the output shaft one revolution to see which first gear ratio you have. A lot of the step vans had the 4.02 first gear ratio installed during the retrofits. "

I would go identify your trans, get the numbers off it and the door tag and see if it's an 18 or 19, then search around and see which model it is.


PS, please post some info on your truck :headbang:

ALSO, your truck would have the t19, t18 was phased out in the early 80's for the fully syncrod T19. Still check those numbers.

Look for the casting number on the gear case.
1301 = T-18
1309 = T-19
Otherwise they are nearly indistinguishable externally


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Last edited by Russo2; April 12th, 2012 at 09:31 PM.
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Old April 12th, 2012, 11:16 PM
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Thanks guys I appreciate the help. That's the same info I've been finding everywhere. Based off the casting number it is a t18. The Trans is still in the truck though, i'm just shootin fit a quick swap. Idk yet what I'll do. I might be going in a different route and just take a couple days and rebuild it myself.

I'd post more info on the truck if I could figure out how hah. It's kinda hard to navigate this site and find stuff on my phone. I don't have a computer and i'm located in the middle of nowhere
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Old April 12th, 2012, 11:18 PM
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We are workin on a mobile site, hopefully that helps.
Here's a quick rebuild the webby did on a t18
http://www.fordtruckclub.net/forum/g...searchid=10266


1990 F150XLTLariat. 300I6. ZF. BDS. 36x16.5x15FC. SAS under construction.

How to: FTC Gallery.

How to: Brick steering column.
How to: Wiper motor removal.
Shop Class 101.
Door Tag Codes.
  #9  
Old April 13th, 2012, 11:44 PM
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Thanks guys, I appreciate the input
  #10  
Old April 14th, 2012, 01:03 AM
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keep the granny alive


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