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toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 06, 2019 02:16PM

Hello CCF,

Working on a New transmission and motor for the v8. Switching to an Aluminum case jerico with stockish O.D. toplaoder guts with better gear spread.

The original setup is still working, but don't want to dismantle a running car atm. The gear set in the car now is starting to give it up. Pops out of 3rd on decel and grinds into 2nd decel. Figured it's time for another project that gets out of hand. Also oil pressure in the motor is low, ran it low on oil one night and it never recovered. Wonder what i have laying around to build?grinning smiley

It's been a great test setup. I would have to guess I have 10k miles on it with very little problems.

Btw, anyone doing a V8. I have been searching the web and found a website with some great info. Check out red dragon automotive. Great info on Saginaw mainshafts.

Here is what has been done so far.

Purchased used Jerico case. Machined to get the same dimensions as a stock cast iron toploader. They are .200 longer over all. Made bushings for the counter shaft hole. Shaft is a lot bigger then stock one. That's about it for the case. Made a billet trans cover.

Bought a new main shaft from david kee in texas. It's the larger 31 spline and it's big enough just to cut and re-spline. No more headache with welding and such. Cut the shaft down and re-splined it myself, moved a snap ring grove for the gear set. If I had used the stock toploader gears I wouldn't had had to do that. so fairly simple so far. Had all the guts REM polished.

Trans is now together and slipped into the c5 for fitment. Next week I'll make some chips and make a new adapter plate. I'll take better pictures this time.

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 06, 2019 02:18PM

more pictures.

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 06, 2019 02:19PM

Have a great day!

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: v8vair ()
Date: April 06, 2019 04:27PM

I already have the adapter and drawings in Cad if interested

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Re: toploader to C5 adapter building.
Posted by: MattNall ()
Date: April 06, 2019 04:35PM

Should be a good setup! How big a BBC will you build!

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: toploader to C5 adapter building.
Posted by: v8vair ()
Date: April 06, 2019 04:47PM

Its will be a kick ass set up ! Id put 572 Inches in front of that transaxle !

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 06, 2019 05:26PM

Hey mike,

That would be a great help to see what different people are doing.
I'm using fusion 360. I can open solid works as well as a few others.


I might do 540 but there is this great 68 vert that happened to go up for sale close by.

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 06, 2019 05:37PM

Btw, did you updgrade the c5 diff with 300m shafts and a new posi unit?

I havce been looking at the trac aide from eaton and wave tech stuff.

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: joelsplace ()
Date: April 06, 2019 05:58PM

[www.enginelabs.com]
This is what it needs. 1750+ HP E85 LS engine.

Joel
Northlake, TX
5 Ultravans, Lost count at 100 Corvairs...

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 06, 2019 07:01PM

I have been staying away from the ls as long as I can. I have a few available to me and worked on some, but I just can't bring myself to do it. If I really get nuts I'll look into a R07 NASCAR engine or at least a sb2.2. I'm not to sure how either one likes to be on the street.

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: v8vair ()
Date: April 07, 2019 06:30AM

Ive been running a stock 3.15 diff, this latest motor made 600 lbs of torque at 5000 rpm and no problems. Id say I have 0ver 250 road racing laps on this set up with no issues. Mike

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Re: toploader to C5 adapter building.
Posted by: v8vair ()
Date: April 07, 2019 06:54AM

I found a seal at McMaster car that fits the Jerico mainshaft right behind the rear bearing area. Its machined on the Jerico,not sure about the toploader but it works well separating the fluids

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Re: toploader to C5 adapter building.
Posted by: v8vair ()
Date: April 07, 2019 07:04AM

Done a little different than narrowing the C5 Cradle

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 07, 2019 11:20AM

Thanks for the pictures.
I may need to grind the main shaft for the seal to run on. whats 1 more time apart? adapter looks great. Bolt hole dimensions would be a great help to check against what I came up with. Trying hard to keep it super narrow. The adapter in the car now is 1/2" thick between trans and diff. Need all the leg room I can get. Wish I had pictures of it, but was in a time crunch when I did it last time. No dimensions either, just a guy with a bridge port and a transfer punch.

Lower subframe looks great. Not sure how I will do the next one, if there is a next one. Road clearance looks better then mine. I had to drop the diff a ton to get the motor to clear the crown cover.

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: MattNall ()
Date: April 07, 2019 11:24AM

Darrin,

On a PC logged into FaceBook? [www.facebook.com]

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: toploader to C5 adapter building.
Posted by: v8vair ()
Date: April 07, 2019 11:33AM

Ill go buy my machine shop and get Harry to print the dimensions and post them

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 13, 2019 01:03AM

Small update:

Mostly taking measurements and stuff. Here is a mock pcs I made on the water jet and the 1" thick pcs it will be made of. I have included the bolt hole dimensions I came up with for anyone that wants to give it a go. The drawing is purely my measurements and guessing. Use at your own risk.

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 13, 2019 01:05AM

couple more:

Darrin
65 Crown
68 Monza convert

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Re: toploader to C5 adapter building.
Posted by: TheRealHip ()
Date: April 13, 2019 10:48AM

How do you handle the shifter linkage...

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Re: toploader to C5 adapter building.
Posted by: Vairefast ()
Date: April 13, 2019 11:36AM

I used 3 solid steel rods all the way back to the trans. Bent them around the motor and hooked them up direct. Just like the factory V8 cars. I may try Morse cables this next time. Here is the best picture I could find. If you want a better one let me know. Here is the the Build for the car.BBC V8 Corvair Build

Darrin
65 Crown
68 Monza convert

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