More motor mount issues help!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

locab36 · 07-06-2004, 09:03 PM

I am in the process of adding the 700r4 and relocating the 350 to the front frame holes. It fit nicely in the rear holes but had virtually no clearance for the HEI. What I figured was that it would move right up 3 inches or so and the 700r4 was 3 inches longer than the turbo 350 it replaced and viola! no driveshaft shortening. Trying to test fit everything and I'm not close on the motor mount stands. Please advise after looking at the pics. I tried switching sides and the botom stand hole seemed to line up the the rear cross member hole but the top still wasn't close. Not enough slack or movement to help.

John in Michigan

tom hand · 07-06-2004, 09:15 PM

Those are i6 stands...you need v-8 stands

Tx Firefighter · 07-06-2004, 10:37 PM

He's absolutely right.

Beware though, your truck has long water pump front accesories. When you move the engine forward, the fan shroud will no longer work (if you even had one to start with).

I've run them for years with no shroud with no problems.

These trucks used short pump set up stock. Yours is 73 and newer vintage.

64fleetside · 07-06-2004, 10:52 PM

If you leave it in the rear holes use the I6 stands & 4wd shroud(its longer). Use V8 stands in forward position ,long pump,trim about 1-2 inches off the 2wd shroud w/sabre saw,Sawzall etc. Brian

locab36 · 07-07-2004, 07:00 PM

Thanks everyone, this board and the information on it has been invalueable. I went to the local old parts salvage yard and found a set of v8 mounts. As stated I had the inline 6 ones. Silly me, I thought I could just slide them forward. Fake motor and 700r4 are in. I slotted the holes in the tranny mount of the corssmember to help use a couple of the many holes in the frame. Found out the drive shaft will likely need lengthening of 1 inch or so for safety. Fits now but not as far in as I would like.

again thanks

John Criswell
Midland, MI

crazy longhorn · 07-07-2004, 09:54 PM

if you drill the eng mount holes (in the stands) out to 5/8", you will be a "happy camper" when swapping engines or mounts(just gives a little more room). good luck,crazyL

*1972C10* · 07-08-2004, 02:16 AM

I used to run LWP on V8 Mounts without any problems even had a stock shroud.

Tx Firefighter · 07-08-2004, 06:58 AM

Quote:

Originally Posted by 1972C10

I used to run LWP on V8 Mounts without any problems even had a stock shroud.

How did you do that without modifying the shroud?

The truck was set up correctly from the factory with the short pump setup and you added a couple of inches with the long pump setup. Something has to give somewhere. Seems like some guys trim the shroud shallower, but I'd like to hear how you did yours.

64fleetside · 07-08-2004, 08:22 AM

You have to trim about an inch or two from the engine side. A little sanding to the cut edge & no one will ever know. Brian

*1972C10* · 07-08-2004, 09:50 AM

I didnt the truck had it when i got it . I still have the shroud ive since then converted to Electric Fans.

Ive had a friend of mine put the LWP set up on his without any problems.

Maybe the flex fan i had was smaller than stock? i want to say it had a 14" fan on it .

highboy_04 · 07-08-2004, 09:53 AM

i dont think my fan shroud is cut and i've got a long water pump. and a 4 core radiator. if someone has the measurement for the shroud i could check to see if its been cut or not.

crazy longhorn · 07-08-2004, 06:50 PM

I think you could run a long pump with a stock depth shroud, but for the shroud to work at its best , the fan needs to be about 1/2 way in/out of the shroud..... crazyL

roadking · 07-08-2004, 07:52 PM

ive got same set up as highboy, v8 position, long water pump,4 core. my fan only sticks outside the shroud about a 1/2". i have not had any problems with over heating. is the optimum place half in half out to catch more air for cooling?

crazy longhorn · 07-08-2004, 10:57 PM

Umm, thats what I thought I said.....if it doesnt overheat, i wouldnt worry too much tho

crazyL

grayw0lf · 07-09-2004, 01:14 AM

So, let me clarify: You are going from a TH350 to a TH700R4 w/o driveshaft modifications! Very encouraging.

How hard is it to modify/setup/replace the trans linkage?

What's a decent used 700R4 go for?

John

Tx Firefighter · 07-09-2004, 07:17 AM

Quote:

Originally Posted by grayw0lf

So, let me clarify: You are going from a TH350 to a TH700R4 w/o driveshaft modifications! Very encouraging.

How hard is it to modify/setup/replace the trans linkage?

What's a decent used 700R4 go for?

John

It depends on which TH350 you have. A 9 inch tailshaft TH350 is the same length as the 700R4 is. The 6 inch TH350 is obviously 3 inches shorter than the 700 is.

krue · 07-09-2004, 10:13 AM

If you have a short shaft th350 the 200r4 is a direct swap. Same length, yoke, linkage etc.

grayw0lf · 07-10-2004, 08:48 AM

Was there a "Standard" Th350 shaft length for a '70 C-10? How does the Th200R4 hold up? Is it as strong as the 350? Does the linkage need any mods?

07-06-2004, 09:03 PM	#1
locab36 Registered User Join Date: Jun 2004 Location: Midland, MI Posts: 265	More motor mount issues help!! I am in the process of adding the 700r4 and relocating the 350 to the front frame holes. It fit nicely in the rear holes but had virtually no clearance for the HEI. What I figured was that it would move right up 3 inches or so and the 700r4 was 3 inches longer than the turbo 350 it replaced and viola! no driveshaft shortening. Trying to test fit everything and I'm not close on the motor mount stands. Please advise after looking at the pics. I tried switching sides and the botom stand hole seemed to line up the the rear cross member hole but the top still wasn't close. Not enough slack or movement to help. John in Michigan Attached Images

07-06-2004, 09:15 PM	#2
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Those are i6 stands...you need v-8 stands __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

07-06-2004, 10:37 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	He's absolutely right. Beware though, your truck has long water pump front accesories. When you move the engine forward, the fan shroud will no longer work (if you even had one to start with). I've run them for years with no shroud with no problems. These trucks used short pump set up stock. Yours is 73 and newer vintage. __________________ I'm on the Instagram- @Gearhead_Kevin

07-07-2004, 09:54 PM	#6
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	if you drill the eng mount holes (in the stands) out to 5/8", you will be a "happy camper" when swapping engines or mounts(just gives a little more room). good luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

07-08-2004, 09:53 AM	#11
highboy_04 Registered User Join Date: Mar 2003 Location: kansas Posts: 1,071	i dont think my fan shroud is cut and i've got a long water pump. and a 4 core radiator. if someone has the measurement for the shroud i could check to see if its been cut or not. __________________ '67 c10 350/th350

07-06-2004, 10:52 PM	#4
64fleetside Registered User Join Date: Apr 2004 Location: arkieland Posts: 1,070	If you leave it in the rear holes use the I6 stands & 4wd shroud(its longer). Use V8 stands in forward position ,long pump,trim about 1-2 inches off the 2wd shroud w/sabre saw,Sawzall etc. Brian

07-07-2004, 07:00 PM	#5
locab36 Registered User Join Date: Jun 2004 Location: Midland, MI Posts: 265	Thanks everyone, this board and the information on it has been invalueable. I went to the local old parts salvage yard and found a set of v8 mounts. As stated I had the inline 6 ones. Silly me, I thought I could just slide them forward. Fake motor and 700r4 are in. I slotted the holes in the tranny mount of the corssmember to help use a couple of the many holes in the frame. Found out the drive shaft will likely need lengthening of 1 inch or so for safety. Fits now but not as far in as I would like. again thanks John Criswell Midland, MI

07-08-2004, 02:16 AM	#7
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	I used to run LWP on V8 Mounts without any problems even had a stock shroud.

07-08-2004, 08:22 AM	#9
64fleetside Registered User Join Date: Apr 2004 Location: arkieland Posts: 1,070	You have to trim about an inch or two from the engine side. A little sanding to the cut edge & no one will ever know. Brian

07-08-2004, 09:50 AM	#10
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	I didnt the truck had it when i got it . I still have the shroud ive since then converted to Electric Fans. Ive had a friend of mine put the LWP set up on his without any problems. Maybe the flex fan i had was smaller than stock? i want to say it had a 14" fan on it .

07-08-2004, 06:50 PM	#12
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I think you could run a long pump with a stock depth shroud, but for the shroud to work at its best , the fan needs to be about 1/2 way in/out of the shroud..... crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

07-08-2004, 07:52 PM	#13
roadking Registered User Join Date: Nov 2003 Location: kc Posts: 229	ive got same set up as highboy, v8 position, long water pump,4 core. my fan only sticks outside the shroud about a 1/2". i have not had any problems with over heating. is the optimum place half in half out to catch more air for cooling? __________________ 71 C10 SWB BLACK AND WHITE 350 CRATE TH350 ENJOY LIFE

07-08-2004, 10:57 PM	#14
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Umm, thats what I thought I said.....if it doesnt overheat, i wouldnt worry too much tho crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

07-09-2004, 01:14 AM	#15
grayw0lf Registered User Join Date: Apr 2004 Location: Clanton, AL Posts: 1,253	So, let me clarify: You are going from a TH350 to a TH700R4 w/o driveshaft modifications! Very encouraging. How hard is it to modify/setup/replace the trans linkage? What's a decent used 700R4 go for? John __________________ 85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days! 05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal!

07-09-2004, 10:13 AM	#17
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	If you have a short shaft th350 the 200r4 is a direct swap. Same length, yoke, linkage etc. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"



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07-10-2004, 08:48 AM	#18
grayw0lf Registered User Join Date: Apr 2004 Location: Clanton, AL Posts: 1,253	Was there a "Standard" Th350 shaft length for a '70 C-10? How does the Th200R4 hold up? Is it as strong as the 350? Does the linkage need any mods? __________________ 85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days! 05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal!

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