4 speed questions // pictures?

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4 speed questions // pictures? Empty 4 speed questions // pictures?

Post by Elkyerik on Thu Sep 12, 2019 3:40 am

I'm in the process of doing a manual transmission swap in my 1973 El Camino and I have some questions.

- Is the pedal hanger bracket up under the dash the same on both automatic and manual transmission?

- Can anyone please post some detail information of the whole 4 speed pedal assembly with the hanger braket and a picture of where the clutch rod goes trough the fire wall?

I will be doing this conversion with a Tremec TKO 600 5 speed transmission and a hydraulic release bearing so I do not need fiddle around with the whole OE mechanical clutch linkage but pictures of the OE set up would be a great help anyway.

4 speed questions // pictures? F4678710
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Post by JF74chevelle on Sun Oct 13, 2019 11:44 pm

All you need is a longer bolt, the clutch pedal bolts to the outside of the bracket.
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Post by Joe73 on Mon Oct 14, 2019 10:43 am

The clutch push rod comes through the firewall below the throttle cable eixt. Its marked on the firewall. Since you are doing a conversion, keep the hole you drill small and use a 70-81 camaro bellows boot. A stock 73-74 boot is unavailable and has a much larger bolt spacing than the camaros. Much easier to access for drilling if you remove the drivers fender well.
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Post by JF74chevelle on Wed Oct 16, 2019 8:40 pm

What od ratio are you going with? .82 or .64.
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Post by Joe73 on Thu Oct 17, 2019 6:55 am

No of in mine. I have the factory 4 speed. All saginaws, muncies, turbo 350 and 400 are all 1:1 final ratio. A 700r4 is .70 final of remember correctly for comparison.
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Post by JF74chevelle on Thu Oct 17, 2019 10:48 am

Joe73 wrote:No of in mine.  I have the factory 4 speed.  All saginaws, muncies, turbo 350 and 400 are all 1:1 final ratio.  A 700r4 is .70 final of remember correctly for comparison.

Sorry joe, I should clarified. I am running a Muncie as well but I’m looking at going to an OD manual soon. I was asking Erik to see what OD ratio he was going for because the .64 is really steep.
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Post by Joe73 on Thu Oct 17, 2019 11:36 am

I used this website calculator to figure out some differences. Looks like having a 5 speed vs. a 4 speed AUTO would lower your final rpm by about 200 rpm. Not much of a difference at all. I'd just like to see that your final rpm is somewhat within the engines built power band so it doesnt lug.
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Post by JF74chevelle on Thu Oct 17, 2019 11:59 am

https://www.crawlpedia.com/rpm_gear_calculator.htm

That is the rpm calculator I found to be most accurate.
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