Crank drilled for 4sp.... how deep?
#1940251
10/28/15 11:21 AM
10/28/15 11:21 AM
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JMCFAN
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So the crank on my 70RR was damaged so machine shop obtained a auto one and drilled it for 4sp application... How deep should it have been drilled...?? I appears from a crude dowel type measurement its a little short. First attempt to install trans it would not mate up to bellhousing... but I need to verify the clutch is centered correctly as well.. Boy I don't want to have to disassemble and take long block back....
68 Charger 383/ AT Green/Green VT 70 Roadrunner 383/4sp Purple/Black VT
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Re: Crank drilled for 4sp.... how deep?
[Re: JMCFAN]
#1940352
10/28/15 02:18 PM
10/28/15 02:18 PM
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Posts: 36,041 Lincoln Nebraska
RapidRobert
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Boy I don't want to have to disassemble and take long block back.... you could pull the pilot bushing out then hand drill the hole deeper (dont have to be dead on) for the shaft to fit with clearance then use the MP roller bearing ( I dont have the app/part # for it offhand) in the larger recess just outside of the hole in the crank flange where a TC nub would normally fit for support. that'd save you a teardown.
live every 24 hour block of time like it's your last day on earth
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Re: Crank drilled for 4sp.... how deep?
[Re: JMCFAN]
#1940409
10/28/15 03:12 PM
10/28/15 03:12 PM
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John_Kunkel
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The factory bushing is 7/8" long and the tip of the input shaft pilot extends about 3/8" past it so, if they only bored the crank deep enough for the bushing, it needs to go deeper.
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Re: Crank drilled for 4sp.... how deep?
[Re: John_Kunkel]
#1940438
10/28/15 03:38 PM
10/28/15 03:38 PM
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The factory bushing is 7/8" long and the tip of the input shaft pilot extends about 3/8" past it so, if they only bored the crank deep enough for the bushing, it needs to go deeper.
Something I can do with hand drill..?? Or take it back....
68 Charger 383/ AT Green/Green VT 70 Roadrunner 383/4sp Purple/Black VT
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Re: Crank drilled for 4sp.... how deep?
[Re: AndyF]
#1940516
10/28/15 05:42 PM
10/28/15 05:42 PM
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What I thought... engine is together...but wont be hard ( or too hard) to strip it down and take it down there....
68 Charger 383/ AT Green/Green VT 70 Roadrunner 383/4sp Purple/Black VT
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Re: Crank drilled for 4sp.... how deep?
[Re: AndyF]
#1940691
10/28/15 10:11 PM
10/28/15 10:11 PM
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JMCFAN
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You can also cut some off of the end of the tranny shaft but I don't like that option very well since then it messes up the input shaft a bit. It might still work for you, just depends how much interference you have. If it is only a small amount I might take it off the tranny but then if you ever swap transmissions you have the same problem again. This a show car which wont be driven a lot...don't see me changing tranny... that option would be less painful... how would you take it off..??? I am always on the side of do it right... grrrr Plan to go talk to machine shop tomorrow....
68 Charger 383/ AT Green/Green VT 70 Roadrunner 383/4sp Purple/Black VT
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Re: Crank drilled for 4sp.... how deep?
[Re: JMCFAN]
#1940701
10/28/15 10:31 PM
10/28/15 10:31 PM
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Joined: Dec 2003
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Big Bad Bee
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If you want to cut the input shaft you can do it with a cut off wheel and bevel with an air grinder. I have an MP bearing for the conversion sealed in bag for the 23 spline I'll sell ya cheap. Pm me
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Re: Crank drilled for 4sp.... how deep?
[Re: kenworth_goose]
#1940726
10/28/15 11:11 PM
10/28/15 11:11 PM
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RapidRobert
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Goose would that be the same one that Bee has?
live every 24 hour block of time like it's your last day on earth
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Re: Crank drilled for 4sp.... how deep?
[Re: kenworth_goose]
#1940744
10/28/15 11:33 PM
10/28/15 11:33 PM
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JMCFAN
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I don't understand why anyone would want to use the old brass bushing instead of the new style roller bearings. Maybe some just don't know. Once you get the crank drilled enough, buy a roller bearing type bearing for a magnum engine. Your transmission will thank you. I am one that doesn't know...???
68 Charger 383/ AT Green/Green VT 70 Roadrunner 383/4sp Purple/Black VT
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Re: Crank drilled for 4sp.... how deep?
[Re: JMCFAN]
#1940788
10/29/15 01:13 AM
10/29/15 01:13 AM
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dogdays
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Re: Crank drilled for 4sp.... how deep?
[Re: kenworth_goose]
#1940801
10/29/15 01:43 AM
10/29/15 01:43 AM
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Big Bad Bee
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I don't understand why anyone would want to use the old brass bushing instead of the new style roller bearings. Maybe some just don't know. Once you get the crank drilled enough, buy a roller bearing type bearing for a magnum engine. Your transmission will thank you. I asked an old friend who was an engine builder, racer and restorer. He said, "we pull bushings out of 60 year old motors that are still in great shape. They're self lubricating and one solid piece. Why would you replace that with a sealed. Lubricated unit that has a bunch of wearing parts?"
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Re: Crank drilled for 4sp.... how deep?
[Re: Big Bad Bee]
#1943709
11/02/15 03:31 PM
11/02/15 03:31 PM
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Joined: Jan 2003
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dogdays
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Because probably your crank needs to be drilled and reamed to size to fit that Oilite bushing, and that is done in a machine shop. Doesn't work so well if you don't have q machine shop handy or the crank's already in the engine when you decide to go manual transmission.
I'd say more than half of the cars talked about on this board go less than 5,000 miles every year. Given the age group many of us are in, that means we'll be dead before that complicated component needs to be replaced.
Keep in mind that the pilot bearing or bushing only sees motion when the clutch is disengaged.
R.
Last edited by dogdays; 11/02/15 03:32 PM.
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