T-18 vs np435
Posting Guru
Joined: Feb 2005
Posts: 2,499
Likes: 1
From: Missoula, MT.
t-18 vs np435
np435 is stronger, and lower geared, shifts better. But...ive never seen a t-18 come up short from a 435 either. they are both VERY strong, and my t-18 shifts really well in my 86.
they made a 435 and t-18 for a long time.
if you are searching for one, look at the door codes A means NP435 and F means t-18.
a t-18 is what im putting behind my 460, but thats just my oppinion.
np435 is stronger, and lower geared, shifts better. But...ive never seen a t-18 come up short from a 435 either. they are both VERY strong, and my t-18 shifts really well in my 86.
they made a 435 and t-18 for a long time.
if you are searching for one, look at the door codes A means NP435 and F means t-18.
a t-18 is what im putting behind my 460, but thats just my oppinion.
Postmaster
Joined: Feb 2003
Posts: 3,439
Likes: 6
From: Spokane WA
in theory, on paper, the t-18 and t-19 are stronger. They were used in light and medium duty trucks. the NP435 was only OEM in light duty trucks.
The NP435 has a slightly lower creeper (6.69:1 vs 6.32:1) so its a better crawling transmission. the T-18 is easier to speed shift 3rd to 4th.
the T18-B is a good 4spd for a grocery getter truck because it doesn't have a creeper, but its 4.32:1 1st gear is still unsycronized
The NP435 has a slightly lower creeper (6.69:1 vs 6.32:1) so its a better crawling transmission. the T-18 is easier to speed shift 3rd to 4th.
the T18-B is a good 4spd for a grocery getter truck because it doesn't have a creeper, but its 4.32:1 1st gear is still unsycronized
Last edited by oldhalftons; Nov 6, 2005 at 12:10 PM.
Senior User
Joined: Aug 2005
Posts: 158
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I had a T-19 in my 87 before I swapped in a ZF 5 speed. 1st is still a granny gear, it's just not as low as the NP435 or T-18 and I believe it was syncro as mentioned above. Otherwise, I believe it is about identical to the T-18. I still have it along with the bell housing, etc for a 460 4x4. It needs a rebuild though. One of the reasons I swapped in the ZF was because it had wicked bearing noise. It wined like it had strait cut gears and rumbled when idling in neutral. I drove it like that for 2 years though and it still shifted fine and never jumped out of gear.
More Turbo
Joined: Nov 2004
Posts: 646
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From: Cleveland, TN
Is it normal for the t-18 to whine??? Because I hear really bad in 1st, 2nd. and 3rd on my truck
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Postmaster
Joined: Feb 2003
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From: Spokane WA
Originally Posted by fordfan302
Is it normal for the t-18 to whine??? Because I hear really bad in 1st, 2nd. and 3rd on my truck
)the 4 speeds with any spur gears at all are louder than transmissions with all helical gears, so you will hear them. old T98's and T18's with Reverse up and right can be pretty loud. At what point normal gear noise becomes a symptom of a problem is hard to say without hearing it.
Fleet Mechanic
Joined: Nov 2003
Posts: 1,500
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Just to let you know both NP435 and T-18's were used in Fseries trucks all the way up to 1989 (at least)...I have 2 1986 F250's one with NP435 and one with T-18. Other than the fact that you can't swap parts between them. I can't tell any difference. Jeep owners I'm told seem to try to get T-18's for change outs but I don't know why they couldn't also use NP435's?
Posting Guru
Joined: May 2002
Posts: 1,306
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From: Bryan/College Station
Either choice is a good one. What it boils down to is which one you come across first. Just make sure the bearings and seals are good, fill it with the proper oil and run it like you stole it.
Chris
Chris
Junior User
Joined: Dec 2005
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Originally Posted by lisagoud
Just to let you know both NP435 and T-18's were used in Fseries trucks all the way up to 1989 (at least)...I have 2 1986 F250's one with NP435 and one with T-18. Other than the fact that you can't swap parts between them. I can't tell any difference. Jeep owners I'm told seem to try to get T-18's for change outs but I don't know why they couldn't also use NP435's?
