4 speed manual tranny

Engine, transmission, rear-end, driveline, etc..

4 speed manual tranny

Postby fireguyfire » Fri Aug 11, 2017 3:57 pm

I have my 1970 d100 stripped right to the frame for a full restoration; the slant 6 will get a refreshening and is on the engine stand.
I have the 4 speed manual transmission in the truck from the factory, and up until I disassembled the truck it operated perfectly. I'm pretty sure the tranny hasn't been touched since new, so I am wondering since it is out of the truck and on the work bench, what would you guys suggest I do as far as freshening up the tranny? I was thinking a gasket and seal kit but I have only ever worked on automatics and am open to suggestions from people who know more about them than I do as to how I should proceed. I am pretty much if it aint broke, don't fix it guy but then again with the entire truck apart it would be crazy not to do at least a basic maintenance on the tranny.
Opinions if this was your truck gents?
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Re: 4 speed manual tranny

Postby HJS » Fri Aug 11, 2017 6:57 pm

These transmissions are pretty bullet proof. Unless you jam your gears because your clutch is out they're fine, and with a slant 6 it should be good. I wouldn't if it's not leaking.
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Re: 4 speed manual tranny

Postby Txas2step » Sat Aug 12, 2017 6:54 am

Cobra has parts and seals if you decide to do some basic's since it is out and much easier to work on. :Thumbsup

https://cobratransmission.com/index.php ... af57b8f4c6
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66 d200 225/4spd/4:10( military)(sold)
68 d100 383/727/3:55
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Re: 4 speed manual tranny

Postby fireguyfire » Sun Aug 13, 2017 8:09 pm

Thanks for the suggestions; I think I'll give it a good clean and once over, then decide from there.
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Re: 4 speed manual tranny

Postby marklein » Sun Aug 13, 2017 10:11 pm

They don't generally break, but they do wear out. I recommend you pull the tower and have a look at the gears. If all appears ok, then you can use silicone to seal it up. I pulled mine apart only to find it worn out, was going to be about 700 dollars in parts to fix it. I'm going the 4500 route.
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Re: 4 speed manual tranny

Postby fireguyfire » Sun Aug 13, 2017 10:15 pm

What would a guy be looking for? Tooth wear, chipped teeth, etc?
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Re: 4 speed manual tranny

Postby 712edf » Mon Aug 14, 2017 12:37 am

fireguyfire wrote:What would a guy be looking for? Tooth wear, chipped teeth, etc?

That plus play in the shafts/gears, wear on the shifter forks.

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