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Joined: Nov 2010
Posts: 31
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2010
Posts: 31 |
How common were 3 speeds trannies that had a hi-low biggy back?
1928 Chevy Capitol, 1927 Chevy, 1960 2 dr HT Impala, 1917 Hudson Touring(Undrcnstr)
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Joined: Feb 2008
Posts: 802
ChatMaster - 750
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ChatMaster - 750
Joined: Feb 2008
Posts: 802 |
Not really sure what you mean by Biggy back. Could possibly be an overdrive unit? The truck 3 speed tranny was pretty small in the case and the 4 speeds were bigger. two different 4 speeds were used, one for 27LM and early 28LO. the second type was used in 28 LP model and is a much better transmission with many parts used up through 36. The early optional 4 speed was wracked with problems. A lot of trucks I have seen had the early 4 speed replaced with the later one.
28 Chevy LO Capitol 1 ton, 28 National 2 dr coach, 71 Chevy Custom Camper 3/4 ton. Also 23 Oldsmobile Economy truck and a 24 Olds sport touring.
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Joined: May 2002
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ChatMaster - 1,000
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ChatMaster - 1,000
Joined: May 2002
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The 3 speed gearbox in 1927 LM trucks and earlier was essentially a passenger gearbox with a different rear mainshaft bearing retainer and uni joint housing ball seat to accomodate the larger truck uni joint.
The 1927 LM series trucks were only offered with a 3 speed gearbox.The early 1928 LO series had an optional 4 speed gearbox offered,was was replaced by a better re-ratioed 4 speed gearbox as standard fitment in the later 1928 LP series trucks.
An underdrive or overdrive would have been an aftermarket fitment.
CJP'S 29
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Joined: Apr 2011
Posts: 375
Backyard Mechanic
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Backyard Mechanic
Joined: Apr 2011
Posts: 375 |
Gidday Kev,
Your just a wealth of info and no-doubt it would be rock solid information at that. Talk to you soon mate, Cheers
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Joined: Apr 2010
Posts: 1,284
ChatMaster - 1,000
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ChatMaster - 1,000
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Thats why they call him the Wizard.
Cheers
Ray
Some say "Street is neat". I prefer "1928 is great" I have documented my 45 years with a 1928 Chev Tourer, from 1973 to 2018, and regulary add other items that I hope are of interest to others. Your comments are most welcome.The story of the Red Chev can be viewed at http://my28chev.blogspot.com/
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Joined: Apr 2011
Posts: 375
Backyard Mechanic
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Backyard Mechanic
Joined: Apr 2011
Posts: 375 |
Gidday Fellas,
While we're all chatting about this "piggy back" box, tell me.....
The aftermarket, 28 Chev extra gear / gearbox that was available and I have forgotten the name of it? "Jackson" or something like that I think.... And yes I am probably wrong so please correct, but how rare are they and were they ever available out here in OZ and does anyone know of any fitted on cars out here???
A mate in Drouin as a 30's something Dodge coupe which he restored back to original condition and he had an extra gear put into that by a bloke who lives in Longwarry Victoria, and I think he ended up with another small gear-lever out the floor and there was quite a bit of work done to the internals of the gearbox, etc but it flies along the road just lovely and does hwy speeds so easily...
Just wondering??
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Joined: May 2002
Posts: 1,213 Likes: 1
ChatMaster - 1,000
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ChatMaster - 1,000
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The overdrive you're thinking of is the Johnson Highway Overdrive.Pretty rare animal too. 
CJP'S 29
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Joined: Nov 2010
Posts: 31
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Nov 2010
Posts: 31 |
A gentleman in Omaha parted out a '27 and sold the engine and tranny on E-bay. Looked like another tranny was mated to it(factory?) with a forward facing shifter.?! Didnt know if anyone was familiar with that.
1928 Chevy Capitol, 1927 Chevy, 1960 2 dr HT Impala, 1917 Hudson Touring(Undrcnstr)
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Joined: Jul 2011
Posts: 147
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jul 2011
Posts: 147 |
I know a fellow that has a Johnson overdrive unit in his spare parts. What is a unit like that worth?? Its like new...and probably available. Have to visit him this summer could ask him if someone is interested in making a offer.
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
It was common in the 20s,30s and 40s for people to cut car frames down mount two transmissions in series, install a heavy duty rear end and use the resulting contraption as a tractor.
How Sweet the roar of a Chevy four!
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Joined: Dec 2001
Posts: 11,162
ChatMaster - 10,000
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ChatMaster - 10,000
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I helped a neighbor replace the blown engine, and transmission in his Farmall with a model A Ford engine, he put a second model A transmission behind the first one, we hacked out the original IH transmission to make room for the Ford stuff.
Life's a long winding trail, love Jesus and ride a good horse!
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