Transmission Questions
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Junior User
Joined: Sep 2006
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From: Grantville, PA
Transmission Questions
I was looking around under my truck last night and it seems like the 4spd is leaking oil out the tailshaft and possible the front too. I see two plugs on the right side so I assume the top is fill and the bottom drain right? I added what little gear oil I had at home to try and top it off last night but my question is what weight do I want to run? I had some 80W90 but its all gone now.
Second question what trans would be a drop in swap and what vehicles would this trans come in? I'm thinking I may like to just replace the trans instead of fix it, why repair when you can upgrade right
Thanks for your help guys I hope to get inspected today so I can "legally" drive the truck around haha.
Second question what trans would be a drop in swap and what vehicles would this trans come in? I'm thinking I may like to just replace the trans instead of fix it, why repair when you can upgrade right
Thanks for your help guys I hope to get inspected today so I can "legally" drive the truck around haha.
Elder User
Joined: Feb 2004
Posts: 909
Likes: 9
From: San Luis Obispo, CA
If I remember correctly, you have a trans with a half-bell cast on the trans housing and the other half-bell bolted to the engine. This limits you on doing a straight bolt-in swap to pre-'53 (?) transmissions. If you use an adaptor, I think this opens you up to almost any trans, except those with integral bellhousings.
Do an internet search on "transmission adaptor" and you should get some good ideas.
Let us know that direction you want to go. For example: close-ratio 5-speed or big truck 4-speed with a grannie gear. Also what sort of budget do you have?
Do an internet search on "transmission adaptor" and you should get some good ideas.
Let us know that direction you want to go. For example: close-ratio 5-speed or big truck 4-speed with a grannie gear. Also what sort of budget do you have?
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Junior User
Joined: Sep 2006
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From: Grantville, PA
Well the truck has a 390 in it supposedly so I'm not sure if it is the original trans or not. I don't have a huge budget for right now I was just hoping to find something out of a junkyard and wanted to know what cars/trucks I should be looking for. I'd be more interested in a non-granny gear first but 4 or 5 speed doesn't matter. I wouldn't be opposed to putting an auto in either 
Thanks for the help.
Any chance a C6 from a 74 truck would fit? Its mated to a 390 already.
Thanks for the help.Any chance a C6 from a 74 truck would fit? Its mated to a 390 already.
Last edited by project40; Apr 25, 2007 at 05:49 AM.
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
well with the FE you have a NP435. you are very limited on options. Either put another 435 it ,swap to c-6 auto or find a top load out of a car. there is a thread on this right now in the fe forum.
Elder User
Joined: Feb 2004
Posts: 909
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From: San Luis Obispo, CA
Sorry, project40, I thought you were talking about your '48 and I see that you are working on your '66 - please disregard my earlier post
My '65 F-100 had a Borg Warner T-98 4-speed from the factory. I am not sure what year Ford went to the New Process 435, but it was the original trans in my '68 F-350. So far as I know they are interchangeable. If your trans' top cover is aluminum it is a NP-435; cast iron - T-98.
If you want to go cheap, I have a few T-98's in parts and together. We are only an hour & a half apart - I an in MD, just south of Gettysburg. I can sell you a complete trans cheap, or give you parts & guidance in rebuilding yours if it is a T-98. PM me if you are interested.
There are other choices - my '68 now has a NP-540 5-speed which is a serious upgrade and would fit your 390 so long as you got the bellhousing along with the trans. 80W90 or similar gear oil would be fine for topping your trans off. The oil does not have to be hypoid and I would not buy the most expensive if it is running out on the road.
My '65 F-100 had a Borg Warner T-98 4-speed from the factory. I am not sure what year Ford went to the New Process 435, but it was the original trans in my '68 F-350. So far as I know they are interchangeable. If your trans' top cover is aluminum it is a NP-435; cast iron - T-98.
If you want to go cheap, I have a few T-98's in parts and together. We are only an hour & a half apart - I an in MD, just south of Gettysburg. I can sell you a complete trans cheap, or give you parts & guidance in rebuilding yours if it is a T-98. PM me if you are interested.
There are other choices - my '68 now has a NP-540 5-speed which is a serious upgrade and would fit your 390 so long as you got the bellhousing along with the trans. 80W90 or similar gear oil would be fine for topping your trans off. The oil does not have to be hypoid and I would not buy the most expensive if it is running out on the road.
Senior User
Joined: Aug 2004
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Originally Posted by project40
Well the truck has a 390 in it supposedly so I'm not sure if it is the original trans or not. I don't have a huge budget for right now I was just hoping to find something out of a junkyard and wanted to know what cars/trucks I should be looking for. I'd be more interested in a non-granny gear first but 4 or 5 speed doesn't matter. I wouldn't be opposed to putting an auto in either Thanks for the help.
Any chance a C6 from a 74 truck would fit? Its mated to a 390 already.
Thanks for the help.Any chance a C6 from a 74 truck would fit? Its mated to a 390 already.
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Junior User
Joined: Sep 2006
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From: Grantville, PA
Wow you guys are awesome, everything I wanted to know in 5 posts or less
Acheda - About the only thing stock on the 48 is door handles Anyways I'll double check which trans I have and let you know what I want to do. How does the T-98 compare to the NP as far as gearing goes? Thanks for your help.
Acheda - About the only thing stock on the 48 is door handles
Anyways I'll double check which trans I have and let you know what I want to do. How does the T-98 compare to the NP as far as gearing goes? Thanks for your help.
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Elder User
Joined: Feb 2004
Posts: 909
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From: San Luis Obispo, CA
T-98 ratios: 6.40, 3.09, 1.69, 1
I have not counted teeth in a NP-435 and I do not seem to have these numbers on my computer. As I remember the NP-435 ratios are pretty similar to the T-98. Maybe someone else can help.
I have had a lot of good experiences with T-98's, but I do think most folks would favor the NP-435 a little. It still uses roller bearings on the countershaft, but they are inside the endcaps instead of inside of the countershaft, so there are about twice as many carrying the load. The NP-435 also uses a single tapered-roller bearing for the input shaft, opposed by a ball bearing on the mainshaft. This thrust is carried between the input shaft and the mainshaft by a roller thrust bearing. I am a little "uncomfortable" with this design, but in practice it seems to work well. One last difference is the pin synchronizer system. My NP-540 also has pin synchronizers and it does feel different when shifting. This is one of those things that boils down to personal preference, but if anyone wants to explore it, lets start a separate thread.
I have not counted teeth in a NP-435 and I do not seem to have these numbers on my computer. As I remember the NP-435 ratios are pretty similar to the T-98. Maybe someone else can help.
I have had a lot of good experiences with T-98's, but I do think most folks would favor the NP-435 a little. It still uses roller bearings on the countershaft, but they are inside the endcaps instead of inside of the countershaft, so there are about twice as many carrying the load. The NP-435 also uses a single tapered-roller bearing for the input shaft, opposed by a ball bearing on the mainshaft. This thrust is carried between the input shaft and the mainshaft by a roller thrust bearing. I am a little "uncomfortable" with this design, but in practice it seems to work well. One last difference is the pin synchronizer system. My NP-540 also has pin synchronizers and it does feel different when shifting. This is one of those things that boils down to personal preference, but if anyone wants to explore it, lets start a separate thread.
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Junior User
Joined: Sep 2006
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From: Grantville, PA
I believe it is a NP trans since it has NP cast on the right side. Numbers are 96....something. In the top where the shift lever goes, the turrent I guess you would call it, do you add gear oil there or does it share with the rest of the trans? It seems like there may be some in there now but its really low.
Elder User
Joined: Feb 2004
Posts: 909
Likes: 9
From: San Luis Obispo, CA
If your trans has an aluminum top cover, it is a NP-435. (The cast NP probably is a good clue as well.)
The fill hole on the right side fills everything. For topping it off, any good gear oil in the 80 to 90 range should be fine. It does not need to be hypoid oil - that is what your axle needs. Don't buy the most expensive oil if it is a leaker.
The fill hole on the right side fills everything. For topping it off, any good gear oil in the 80 to 90 range should be fine. It does not need to be hypoid oil - that is what your axle needs. Don't buy the most expensive oil if it is a leaker.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The cap to remove the shift lever on a Warner trans threads on, the one from a New Process twists off by a 1/4 turn. The NP cap is held on by two pins that protrude from the shift tower, just below the lip.
Both the Warner T-18, and the New Process 435 transmissions were available for FE engines the NP's were the most popular.
Both the Warner T-18, and the New Process 435 transmissions were available for FE engines the NP's were the most popular.
Last edited by NumberDummy; Apr 27, 2007 at 06:48 AM.
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Junior User
Joined: Sep 2006
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From: Grantville, PA
It is definitely the 2 pin and twist one I replaced that cap already since it would not stay locked down. The boot that is over the shift lever now looks like some universal type peice since it fits but not exactly right. I'll have to pickup the correct boot too. The to-do list keeps on growing.
I replaced that cap already since it would not stay locked down. The boot that is over the shift lever now looks like some universal type peice since it fits but not exactly right. I'll have to pickup the correct boot too. The to-do list keeps on growing.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Originally Posted by project40
The boot that is over the shift lever now looks like some universal type piece since it fits but not exactly right. I'll have to pickup the correct boot too. The to-do list keeps on growing.