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Going back to a manual transmission

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amoparlady

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I am going back to a manual transmission in my 1967 Belvedere.It came with a 4 speed from the factory and it was switched out for an automatic way before I bought it.I have found a 1966 4 speed for sale already rebuilt with the brake and other parts I need to do it.Looking at a 5 speed from American Powertrain too.Going behind a 512 I am building up.Which one
 
I'd say it depends on how you plan to drive your car & what your rear end gear ratio is. If you want to highway drive the car and you have 2.76 or 2.94 gears, you can get away without overdrive, so go with the 4spd, it will be MUCH cheaper. If you have more cash & might drag race the car, then go for 3.91 or 4.10 gears & an overdrive....just my opinion.
 
At least take a look at the Silver Sport Temec 5. Good value, and works good for me. Known as SST.
 
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amoparlady said:
I am going back to a manual transmission in my 1967 Belvedere.It came with a 4 speed from the factory and it was switched out for an automatic way before I bought it.I have found a 1966 4 speed for sale already rebuilt with the brake and other parts I need to do it.Looking at a 5 speed from American Powertrain too.Going behind a 512 I am building up.Which one
Click to expand...
66 four speed with brake, you lost me!
 
It's going to be a street car.I know the person that rebuilt it,he did it correctly.
 
I ment brake and clutch pedals,The 4 speed came out of a GTX with a 440.
 
Go to search box and type 5 speed conversions, there are threads on this.
The simple and cheapest factory parts, may have cut or buy a driveshaft.
Bet a 5 speed $5k plus and fabrication .
Edit: Rear end gears 3.23 better if you go 3.55's.
 
We had a customer who used one of the later truck 833 OD Transmissions(.73) in conjunction with 3.55 geared 8 3/4 pumpkin, and using an honest 28" diameter tires behind his Street 512, small HR Cam that pulled 625 Ft/Lbs on the Dyno ?
He raves about it... says he cruises 70-75 mph at 22-2300 rpm, which is just "enough" rpm for the Engine to have good fuel efficiency for that particular Performance HR Cam profile ?
If I remember correctly, he redid the 833 ratios as well to around 2.6 / 1.6 / 1:1, and then the .73 OD ? which behind the 512's extremely flat and very long torque curve, actually pulls really hard !

Just say'in.....
seems a LOT of people when switching to OD Transmissions completely forget that many performance Cam profiles ain't real HAPPY cruising down at 1800-2000 rpm.... especially under any "loads" ?
and some of these 5 and 6 speed gearings may be kinda superfluous behind a 512's Torque profile ?
 
"”
Challenger340 said:
We had a customer who used one of the later truck 833 OD Transmissions(.73) in conjunction with 3.55 geared 8 3/4 pumpkin, and using an honest 28" diameter tires behind his Street 512, small HR Cam that pulled 625 Ft/Lbs on the Dyno ?
He raves about it... says he cruises 70-75 mph at 22-2300 rpm, which is just "enough" rpm for the Engine to have good fuel efficiency for that particular Performance HR Cam profile ?
If I remember correctly, he redid the 833 ratios as well to around 2.6 / 1.6 / 1:1, and then the .73 OD ? which behind the 512's extremely flat and very long torque curve, actually pulls really hard !

Just say'in.....
seems a LOT of people when switching to OD Transmissions completely forget that many performance Cam profiles ain't real HAPPY cruising down at 1800-2000 rpm.... especially under any "loads" ?
and some of these 5 and 6 speed gearings may be kinda superfluous behind a 512's Torque profile ?
Click to expand...
Challenger340 said:
Whats the story on the Passon A-855 5 spd "Bolt-in" OD Trans for Mopars ?
Ratios look absolutely perfect for the high ratio BB Mopars ?

https://www.passonperformance.com/c...son-performance-a-855-five-speed-transmission
Click to expand...
Careful, Passon walks on water here. Pal has one in his 70 ‘Cuda. Works good, good ratios. Has been back to Pennsylvania at least once for repair. Jumping out of first. Years long waiting list. If he ever pulls it, I’d buy it from him since he endured both the wait (2010) and repair. That said, the Silver Sport Tremec SST is perfect so far.
 
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Passon makes a good transmission but their production is seemingly slow. Some people would surmise they do this to keep supply down and drive / justify high prices. Who knows...

I ran a darkhorse performance Tremec TKO in my 68 Charger for a few years and am currently doing a T-56 swap... both work just fine but are not "bolt in" -
 
download (25).jpg
 
At least y'all have the option of just ignoring her by using the ignore feature.....:D
 
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