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04-18-2021, 01:43 PM | #1 |
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3 speed rebuild
Who here has had their 3 speed rebuilt? I am almost finished with my 70 C10 restoration and one of the things everyone said not to touch if it isn't broke was my 3 speed transmission. After a short drive out of the shop and back in the transmission developed a pretty major leak. I assume from the input shaft. At least it's easy to remove. About what does it cost to have one rebuilt. I am not sure if it's a Muncie or a Saginaw.
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04-18-2021, 03:57 PM | #2 |
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Re: 3 speed rebuild
If the trans works good (ie No noise or grinding & doesn't jump out of gear) you do not need to o-haul it to fix a leak. If it is the input shaft you can remove the front retainer & replace the seal & gasket easily. If it is the rear seal You can pull the drive shaft & remove the seal & replace it. The side cover & rear housing gaskets can be replaced without much trouble.
George |
04-18-2021, 04:04 PM | #3 | |
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Re: 3 speed rebuild
Quote:
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04-18-2021, 04:18 PM | #4 |
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Re: 3 speed rebuild
There is a thread on the forum about the standard transmissions.
I can't remember who started it. .
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04-18-2021, 05:20 PM | #5 |
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Re: 3 speed rebuild
Found this link below
Probably a Saginaw?? These trans only have a few differences, I think the speedometer being on the tailhousing is the key to finding out which one it is. Link:https://www.drivetrain.com/parts-cat...smissions-v24# SAGINAW 1966-81 Cars, 1966-87 Light Duty Trucks: Cast iron case and extension housing with 7-bolt side cover. Fully synchronized with 30 tooth synchro rings. 1966-69 units may have electric overdrive. It has a four step cluster and all the gears are helical cut. MUNCIE (Heavy Duty) 1969-74 Cars, 1969-76 Trucks Cast iron case and extension housing with 7-bolt side cover. Fully synchronized with 36 tooth synchro rings. This is the only GM 3 speed with the same bearing front and rear. This transmission is found in performance applications. .
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04-18-2021, 06:06 PM | #6 | |
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Re: 3 speed rebuild
Quote:
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04-18-2021, 07:09 PM | #7 |
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Re: 3 speed rebuild
Easy eyeball check.
Saginaw has one bolt in the top centre of the side cover, Muncie has 2 about 6 inches apart. |
04-18-2021, 07:21 PM | #8 |
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Re: 3 speed rebuild
03BlkZ
When I was searching I found this thread with a picture you took. Link:https://67-72chevytrucks.com/vboard/...ransmission+id .
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04-18-2021, 07:27 PM | #9 | |
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Re: 3 speed rebuild
Quote:
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04-18-2021, 08:01 PM | #10 |
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Re: 3 speed rebuild
I have no experience with buying parts for these transmission.
I have drove trucks with those transmissions in it. I have one parts truck with a 3 speed. Looking back at the comments/ members have said both ways . I don't know. It has got me wondering which one I have? There are 3 different numbers on the castings. Hopefully You can nail it down with them. The side shifter plate covers has a different bolt pattern. Also speedometer location is different. Hope this helps you. . .
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04-18-2021, 08:39 PM | #11 | |
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Re: 3 speed rebuild
Quote:
Last edited by 03BlkZ; 04-18-2021 at 08:49 PM. |
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04-18-2021, 09:37 PM | #12 |
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Re: 3 speed rebuild
You can get seals from here.
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04-18-2021, 10:22 PM | #13 |
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Re: 3 speed rebuild
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04-19-2021, 08:56 AM | #14 |
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Re: 3 speed rebuild
Huh!
Try this. [url]http://www.advanced-ev.c/url] Last edited by geezer#99; 04-19-2021 at 09:43 AM. |
04-19-2021, 11:50 AM | #15 |
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Re: 3 speed rebuild
Very timely in that I just bought the rear seal and bushing for my truck with the 3 speed Saginaw. I am not sure the bushing is bad in mine but it wasn't that much more to buy it with the seal.
I've been searching online for a definitive answer but I'll ask it here. Can you remove the tailshaft housing to replace the output shaft bushing without a complete teardown?
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04-19-2021, 12:04 PM | #16 | |
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Re: 3 speed rebuild
Quote:
Most transmissions will not require a bushing replacement. Pull the seal and test fit the yolk without the seal. if you have more than about .005 radial play replace the bushing. Use no sealer on the OD of seal when you replace it. The Green or Red coating is actually a glue/sealer. Do these transmissions even have a seal on the input shaft? I doubt it, but my memory may not be reliable. Rick |
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04-19-2021, 01:28 PM | #17 |
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Re: 3 speed rebuild
Sure they have a seal.
Here’s the link I finally figured out. http://www.garagemotorsports.com/muncie.htm |
04-19-2021, 08:49 PM | #18 |
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Re: 3 speed rebuild
I know the Muncie 4 speed do not have a seal in the input shaft.
The Muncie 3 speeds is based on the 4 speed Muncie. I am confident it will not have a seal. It relies on a slinger and a reverse thread to channel the oil back into the case. Part number 3, in the link you posted, is the input shaft bearing retaining nut, not a seal. Possible the Saginaw does have an input seal. That I am not sure of as not many of these get rebuild anymore. The last 3 speed I had was replaced with a 4l60. Some 4 speeds like the Super T10 do have input seals, I can send you a picture of that one as it is apart in the shop. Rick |
04-19-2021, 09:32 PM | #19 |
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Re: 3 speed rebuild
On the link they post a seal for the Saginaw.
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