granny gear?
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granny gear?
I'm considering swapping out my shot RUG for a t-18. I really like the overdrive of the RUG but from what i hear they are worthless transmissions. I will be lifting the truck a few inches and putting 34 or 35 inch tires on it. My question is would i be able to use the low unsynchronized first gear of the t-18 all the time when starting from a stop. If i can do this i figure it would not be necessary to re-gear it. Basically can the granny gear be used like a normal 4 speed transmission? I was also thinking with larger tires and not re-gearing i would gain my overdrive back. Would it be a good idea to use the transmission in this way? Thanks, Josh
Elder User
Joined: Nov 2004
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I don't know how hard they are to find, but you may like the T19 too. 1st is synchronized and it came (in Fords) in 3 flavors:
ratios:
4.02, 2.41, 1.41, 1
5.11, 3.03, 1.79,1
6.32, 3.09,1.68,1 (same as T18)
In all flavors, R is 6.96 (compared to 7.44 for the T18)
If you go junkyard hunting for one, the T19 looks a lot like the T18, but it has a PTO port on both sides, the T18 has PTO on pass side only.
ratios:
4.02, 2.41, 1.41, 1
5.11, 3.03, 1.79,1
6.32, 3.09,1.68,1 (same as T18)
In all flavors, R is 6.96 (compared to 7.44 for the T18)
If you go junkyard hunting for one, the T19 looks a lot like the T18, but it has a PTO port on both sides, the T18 has PTO on pass side only.
Post Fiend
Joined: Jan 2000
Posts: 5,330
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From: Dryden, ON, Canada
Axle code 19 is 3.55. 35's will get you back reasonably close to what stock cruise rpm would have been with the O/D box and stock tires.
The T19 is a 460 and diesel only unit from the factory, with the 4.02 version being common behind 6.9's. They're a little harder to find, but, they are a good unit.
Both my 460 and 6.9 had the 5.11 gearset in them stock. According to a Ford TSB it was only the 83 and early 84 6.9 trucks that got the 5.11 gearset, but the tag on my 6.9's transmission points to an 86 build date and it being the factory transmission.
The T19 is a 460 and diesel only unit from the factory, with the 4.02 version being common behind 6.9's. They're a little harder to find, but, they are a good unit.
Both my 460 and 6.9 had the 5.11 gearset in them stock. According to a Ford TSB it was only the 83 and early 84 6.9 trucks that got the 5.11 gearset, but the tag on my 6.9's transmission points to an 86 build date and it being the factory transmission.
Elder User
Joined: Apr 2003
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From: Maryland
Ditto on the T-19... I have both a T-19 and NP435 (un-sync'd 1st). I never realized how nice it is to able to shift into first without not having to come to a complete stop until I picked up my '86!
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Well i went and just picked up a t-18. Thats all there was at the junkyards around town and it was only 90 bucks and it looks good and feels good so i went ahead and pulled it. Maybe if i find a t-19 down the road ill grab it but this should work for now. Is there anything i should to do the transmission besides change the fluid out before i put it back in? Also what should i put in it? just 80-90w gear oil? Thanks, Josh
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Elder User
Joined: Apr 2009
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From: San Diego
I'm doing this swap right now, boy what a pain it was to get the t-18 in. It is so much heavier than the rug it isn't funny.
I don't know what your setup is, but you may find when you put it in that you have to turn the tranny crossmember around to accommodate the t-18.
edit: and I am going to put valvoline 90 wt in mine...
I don't know what your setup is, but you may find when you put it in that you have to turn the tranny crossmember around to accommodate the t-18.
edit: and I am going to put valvoline 90 wt in mine...
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Well i got the t-18 in. It ended up taking forever though. I went ahead and put in a new rear main seal which was a pita. It the two piece one that you supposedly have to to take off all the main bearing caps and lower the crank a little to put it in. But luckily i just had to take off the one cap that holds the seal and was able to just push the new one through. Got rid of a lot of vacuum lines and the air pump. With all that it ended up taking me and a buddy a solid 20 hours over two days to get it done. But that is including the 50 trips to the parts store for random stuff i needed. But it drives really good now and the transmission works great. I was a little worried about using a junkyard transmission. 6fifty my crossmember actually ended up bolting right up. Not sure if yours is 4x4 or not but mine is and maybe thats the difference?
