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#1 |
Registered User
Join Date: Dec 2011
Location: Odessa, Tejas
Posts: 30
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Does lowering change drivetrain mounts?
Hey folks, getting to the point where all my major pieces (engine, tranny) are getting wrapped up but I have a question. I've installed a 3" CPP drop axle and 3" drop mono's on the front. Not sure yet what I'm doing to get the rear that low (Flip vs reverse eye mono).
The engine is a 235 but we are going with a 200 4r tranny so the mount will be a crossmember from CPP. Does a static drop of 6" or more change how the tranny will sit if I'm using the original motor and motor mounts? Or can I just buy the crossmember and call it safe? In most cases, I see that changing the spring pads on the axle happens so is the pinion angle different when lowered? Thanks guys. This is my son's 58 Apache fleetside.
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Struck down, but not destroyed 2 Cor 4:9 1958 Apache 32 |
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#2 |
Registered User
Join Date: Sep 2012
Location: Oregon
Posts: 3,303
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Re: Does lowering change drivetrain mounts?
Not unless you are laying frame and need to "tuck" the trans/driveline etc. When you hang the 2004r from the adapter and set the cross member, make sure the tail shaft is at 3 degrees down. I used a non-ratchet tie down looped over the frame rails and hung the tailshaft high. I shortened the ends of the crossmember to fit inside the rails and then bolted it to the trans. Lowered it down while watching the degree gauge until it rested at 3 degrees and tacked in the cross member. You also want the rear pinion measured at flange up 3 degrees.
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#3 | |
Registered User
Join Date: Dec 2011
Location: Odessa, Tejas
Posts: 30
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Re: Does lowering change drivetrain mounts?
Quote:
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Struck down, but not destroyed 2 Cor 4:9 1958 Apache 32 |
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#4 |
Registered User
Join Date: Oct 2011
Location: Pittsburgh Pa
Posts: 267
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Re: Does lowering change drivetrain mounts?
You want the vehicle sitting close to its normal ride stance that way the motor will be sitting at 3° while driving.
Also since its a leaf sprung vehicle, your gonna want to set the rear pinion at 2° instead of the normal 3° only to help compensate for the axle wrap associated with leafs when under throttle. Posted via Mobile Device
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91 s10 - bagged bodydropped 4", 350/700R4, narrowed reared, cantilever rear air bag setup 1951 chevy 3100 - in build/acquiring parts process. Have full C4 Corvette suspension front and rear, tpi 350, 700r4, 18" torque thrust II wheels |
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#5 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,853
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Re: Does lowering change drivetrain mounts?
I have the same axle and leaf drop up front as you and I'm running 6" reverse eye mono's on the back. I set my pinion angle on my diff at 2 degrees up and the tail shaft at 3 degrees downward.
Did you install any caster shims up front? Once you lower it that far you need to re-adjust your caster. I bought a 6 degree shim kit from Performance online
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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#6 |
Registered User
Join Date: Jan 2012
Location: Motown
Posts: 7,680
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Re: Does lowering change drivetrain mounts?
the mounts are basically the same, but...
the trans mount is about the easiest thing to fabricate on your truck why buy a piece of pipe?
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#7 |
Registered User
Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 820
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Re: Does lowering change drivetrain mounts?
Maybe this will help
http://jniolon.clubfte.com/driveline...nephasing.html |
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#8 | |
Registered User
Join Date: Dec 2011
Location: Odessa, Tejas
Posts: 30
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Re: Does lowering change drivetrain mounts?
Quote:
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Struck down, but not destroyed 2 Cor 4:9 1958 Apache 32 |
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#9 |
Registered User
Join Date: May 2000
Location: Flin Flon, Manitoba, Canada
Posts: 8,853
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Re: Does lowering change drivetrain mounts?
i used a set of reverse eye mono's in the rear to drop it 6 inches to match the drop in the front
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My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795 |
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#10 |
Registered User
Join Date: Dec 2011
Location: Odessa, Tejas
Posts: 30
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Re: Does lowering change drivetrain mounts?
Thanks for all the replies, gents. I decided to go with the flip kit and adjust from there.
__________________
Struck down, but not destroyed 2 Cor 4:9 1958 Apache 32 |
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#11 |
Registered User
Join Date: Apr 2009
Location: Chandler AZ
Posts: 750
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Re: Does lowering change drivetrain mounts?
I noticed with mine (very similar to Dubies setup) that the center frame cross support above the trans tailshaft is very close (~1/2") to the driveshaft. I have had no problems with it contacting but I don't have a bed floor. This may become an issue for me once I try to haul a load, if that day ever comes.
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#12 |
Registered User
![]() Join Date: May 2012
Location: Finley, TN.
Posts: 198
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Re: Does lowering change drivetrain mounts?
I would get the rear setting where it is going to be berore I tried to set any angles.
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#13 | |
Registered User
Join Date: Dec 2011
Location: Odessa, Tejas
Posts: 30
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Re: Does lowering change drivetrain mounts?
Quote:
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Struck down, but not destroyed 2 Cor 4:9 1958 Apache 32 |
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