The Stovebolt Site Forums The Shop Area Engine Shop '68 C60 5-speed trans

What are the possible 5-speed tranmissions to be found in 1968 C-60? I think 4th and 5th gear are blown in mine and I want to scout junkyards for better ones. also, if you know anything about identify which trans is which or where the serial numbers would be located on the gearbox? I've tried double clutching these gears and they still clash.

PS the trans is synchronized, and shifts well between 1st 2nd and 3rd without double clutching

This may seem like a silly answer but have you looked inside the glove box door for a build sheet? There were pasted inside with a description and lots of part numbers in that era.

If it's a std. GM supplied 5 speed tranny in that day it is likely a Clark 282 or 285 series. The difference if I remember correctly was that one was a close ratio model, can't recall which one however. It is possibly a Spicer but these were much heavier built and usually not put into C60 series units. In any event there should be a mfg'rs tag on the transmission.

Interesting, i've never even heard of a Clark. It is a C-60 full length school bus, I dont know if that would prompt them to use the heavier spicer unit. I assumed it would be a muncie. I'll look for that build sheet though.

They put in a bunch of Clark 5 speeds back then. Try going to Jolly's website www.6066gmctrucks.org and look for the tranny info. GMC and Chevy used a lot of the same parts.

School buses were purchased on bids so the low $ usually wins out. That means you can bet your boots it is not a Spicer. The Spicers were generally seen on dump trucks, wreckers, utility company buckets, etc. and others where severe service was the norm and buses don't see much of that.

Here's the ratios for the Clark 282V & 285V:

282V (H) 6.99/4.09/2.17/1.17/1.00/5.89R
285V (H) 6.99/4.09/2.24/1.46/1.00/5.89R

Pat
**************
1952 Chevy 1434 (Canadian 3800)

There are some Clarks out there with 5th gear as an overdrive, if you want a bit more highway speed.

are Clarks any good? it sounds like an acme brand transmission that the roadrunner might put in Wile E. Coyote's GMC to make it break down faster. And good point about the low-bid thing for the schoolbuses.

darn i reversed that but you know waht I mean

Most of those 5 speeds were Clarks. They are a tough trany & are easy to rebuild. Parts are probably available at one of the large truck parts supplyers.

Clarks were good trannys, and by 68 most of them were synconized. Only problem is the price, and parts are getting tough to find for some of them. I went to look for one of the overdrives and was told to expect the tag to be over $1,000 if I found one.

Thanks for all the info. I'll post what I find underneath this thing when I finally get out to the storage yard. I'm pretty sure this gearbox in synchronized, as i said before it shifts well between 1st 2nd and 3rd w/out double clutching

Finally got under it today. The transmission tag was partially blocked by one of the homemade dual exhausts, but the number I came up with is 3152-F. According to Jolly's webpage, 3152-A and 3152-C units are Spicers, so I'm assuming that 3153-F is a Spicer variant.