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| | | | Joined: Jun 2010 Posts: 71 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 71 | My 67 C10 currently has the non synchro 1st gear 3 speed. I’ve purchased a different 3 speed that came out of a early 70s van with the same engine (250ci) that my truck has. I was lead to believe it would be a straight forward swap out. Unfortunately it’s not that simple. It looks as though I’ll need different shift linkage and shorter prop shaft. Does anyone know where I can get the linkages I’ll need & also other things to be aware of? | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | It is pretty simple to learn to double clutch the few times one needs to shift into first gear while moving.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | That body style ran until 1972, and those trucks had the fully syncro transmission. Look in the junk yards, online forums for 67-72 chevy/gmc trucks. The drive shaft can be shortened are if your searching junk yards it's probably 3 inches shorter.
Tommy
59 apache 1/2t
261 short stepside
| | | | | Joined: Apr 2005 Posts: 2,098 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,098 | 67 6cyl trucks came with the Muncie 318 non syncro trans with the short tail housing. As you found out the differences are the side cover, shift rods, and length. The later Saganaw unit could also could require a fine spline front yoke depending on the year. All of this can be worked around, the rods can be replaced or bent to fit the later side cover and the driveshaft can be modified. The Saganaw is a much better transmission overall and worth the effort. The Muncie is about 15" vs the Saganaw at about 22".
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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