Originally posted by Stewzer55
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74 NovaMan's 1979 Chevy Truck - LS Swap - 5/6 Drop
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Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
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need to figure your tire diameter in to the overall gear ratio as well... I'd probably run a 3.42 with the OD 3.31 without...just my personal experience...3.73 works well with a 31 inch tire... about 2000 rpm at 70 mph...in OD...locked converter...Last edited by silver_bullet; April 12, 2016, 05:24 PM.Patrick & Tammy
- Long Haulin' 2008, 2009, 2010, 2011, 2012, 2014...Addicting isn't it...??
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Originally posted by 74NovaMan View Post
Do you have any feel for how much you gained (mpg-wise) with the lockup?
I wonder if the TH350C and the 700R4 use the same converter? Sounds like something GM would do.....
If you need pictures or info on how the 350c lockup is actuated let me know, I'll snap pictures and spill the beans.Of all the paths you take in life - make sure a few of them are dirt.
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Originally posted by STINEY View PostThen I decided to hook up the little vacuum switch that engages the lockup electrically just to play with it. Wired in a toggle switch to be able to deactivate lockup from the drivers seat. That did come in handy while towing on long gradual grades, it tended to "hunt" a little bit.
Originally posted by STINEY View PostIf you need pictures or info on how the 350c lockup is actuated let me know, I'll snap pictures and spill the beans.
Edit: The savings above were calculated at $4 per gallon.Last edited by 74NovaMan; April 13, 2016, 10:55 AM.Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
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Originally posted by silver_bullet View Postneed to figure your tire diameter in to the overall gear ratio as well... I'd probably run a 3.42 with the OD 3.31 without...just my personal experience...3.73 works well with a 31 inch tire... about 2000 rpm at 70 mph...in OD...locked converter...
and wrap them with these:
It's a 245/50 R16 - the same tire the Camaro takes. (cheap and available and not likely to go out of production soon - I hope) 25.7 inches tall with a 8.5 inch tread width and 10 inch section width. I'll probably want to lower it some first.Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
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Underhood vacuum switch that takes the signal from the carb and completes the electrical signal to the transmission. Only allows lockup with high vacuum signal, and unlocks as soon as the signal drops (throttle blades open further)
Literally a ignition hot input and output.
Underdash showing the other end of the wires above.
I spliced a toggle switch into the circuit, and a indicator light so I could "see" the converter lock and unlock.
Black toggle is the one I used to control lockup. The red light below lights up when locked. Not necessary but interesting to watch at first......later was lots of fun as passengers would panic when the red light came on! Oh my!
Not much to it in reality. Very simple to figure out if already there, and very easy to add to a vehicle without th350c lockup from the factory.
Hope this helps.
Of all the paths you take in life - make sure a few of them are dirt.
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That's great! Thanks!Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
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Green and purple carpet!
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Originally posted by silver_bullet View PostChris,
Have you considered BFG Radial TA 295/50R15? It would fit the stock 15X8 wheel. I used to run 31X10,50X15 on my old C-10's
Originally posted by 1badmonkey View Postto run that short of a tire... you will need to SLAM that truck
Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
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Originally posted by STINEY View Post
Yeah baby, yeah! (hi-jack over)
Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
74 Nova Project
66 Mustang GT Project
92 Camaro RS Convertible Project
79 Chevy Truck Project
1956 Cadillac Project
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