Difference in high hump hole location ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Never enough · 10-16-2017, 12:01 PM

I am looking at getting a hump to convert my 1969 C10 auto to 4 speed but came upon 2 different hole locations. What is the difference in application for these ?

Keystone_Hate · 10-16-2017, 12:12 PM

I believe it depends on the location in which the engine is mounted. If it's a small block, there are two different mounting locations for the engine. The forward mounting being the stock location for 2wd. The rear mounting location being stock for 4x4. This would dictate how far front or back your trans will be, which determines where your shifter will come through the hump. Make sense?

Edit: Also if you have an inline six it will be mounted in the rear position so you will need the hump with the hole further back.

Never enough · 10-16-2017, 01:43 PM

Well, the inline 6 theory makes more sense for this particular hump, since there is no second hole for a transfer case shifter.

Guess I'll stick with the forward hole cover and hope it lines up on the '89 chassis with bb and 5 speed.

Don Quixote · 10-21-2017, 09:37 AM

Do you happen to still have the doghouse with the rear hole? I need one for my 292/465.

**Bob B.** · 10-24-2017, 04:01 PM

My V-6 GMC has the rear hole, and it's a 4X2. Having the New Process 435 transmission might make a difference too.

irl104 · 10-24-2017, 04:34 PM

Mine is a 68 and has a 292 with a new process four speed transmission and takes the one in the second picture, which the hole is further back on the high hump.

Mike C · 10-25-2017, 09:24 AM

All 3 engine families (maybe 4 with GMC V6) have the motor in a different location. The big block is the most furthest forward which is probably the first pic you have, then the small block in the 2nd pic.

4 wheel drives obviously have 2 holes for manual trans and one for autos.

CrewCab59 · 10-25-2017, 09:55 AM

If you need pics, I can post up both of my C/30 cab chassis 350/4spd and 292/4spd.

Thanks

10-16-2017, 12:01 PM	#1
Never enough Registered User Join Date: May 2010 Location: Stillwater, MN Posts: 94	Difference in high hump hole location ?? I am looking at getting a hump to convert my 1969 C10 auto to 4 speed but came upon 2 different hole locations. What is the difference in application for these ? __________________ 1969 Chev C10 1989 Chev R3500

10-16-2017, 12:12 PM	#2
Keystone_Hate Registered User Join Date: Apr 2017 Location: Colorado Springs Posts: 129	Re: Difference in high hump hole location ?? I believe it depends on the location in which the engine is mounted. If it's a small block, there are two different mounting locations for the engine. The forward mounting being the stock location for 2wd. The rear mounting location being stock for 4x4. This would dictate how far front or back your trans will be, which determines where your shifter will come through the hump. Make sense? Edit: Also if you have an inline six it will be mounted in the rear position so you will need the hump with the hole further back.

10-16-2017, 01:43 PM	#3
Never enough Registered User Join Date: May 2010 Location: Stillwater, MN Posts: 94	Re: Difference in high hump hole location ?? Well, the inline 6 theory makes more sense for this particular hump, since there is no second hole for a transfer case shifter. Guess I'll stick with the forward hole cover and hope it lines up on the '89 chassis with bb and 5 speed. __________________ 1969 Chev C10 1989 Chev R3500

10-21-2017, 09:37 AM	#4
Don Quixote Registered User Join Date: May 2008 Location: Woodlawn, TN Posts: 275	Re: Difference in high hump hole location ?? Do you happen to still have the doghouse with the rear hole? I need one for my 292/465. __________________ Rocinante: 1972 GMC C25, 292, SM465, 14 bolt, power nothing, 440k and still handles my PCS moves Jorge: Kia Roller-skate with lots of buttons for the wife Wovoka: 2017 Indian Chief Vintage, better on gas but not much So far, this is the oldest I've ever been.

10-24-2017, 04:01 PM	#5
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,369	Re: Difference in high hump hole location ?? My V-6 GMC has the rear hole, and it's a 4X2. Having the New Process 435 transmission might make a difference too. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

10-24-2017, 04:34 PM	#6
irl104 Registered User Join Date: Nov 2014 Location: Martinsville, IN. Posts: 251	Re: Difference in high hump hole location ?? Mine is a 68 and has a 292 with a new process four speed transmission and takes the one in the second picture, which the hole is further back on the high hump.

10-25-2017, 09:24 AM	#7
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: Difference in high hump hole location ?? All 3 engine families (maybe 4 with GMC V6) have the motor in a different location. The big block is the most furthest forward which is probably the first pic you have, then the small block in the 2nd pic. 4 wheel drives obviously have 2 holes for manual trans and one for autos. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

10-25-2017, 09:55 AM	#8
CrewCab59 Registered User Join Date: Jul 2010 Location: Knoxville,TN Posts: 1,185	Re: Difference in high hump hole location ?? If you need pics, I can post up both of my C/30 cab chassis 350/4spd and 292/4spd. Thanks __________________ 1972 Custom Deluxe 20 4x4 burb 1971 GMC SWB CST 4x4 1972 GMC k20 4x4 (X- brush truck ) 1971 Chevy CST Blazer 4x4 1971 Chevy C/10 1970 Cab Chassis C30 157" 1971 Cab Chassis Custom 30 Deluxe 157" 292/4spd ( Napco Replica ) 1988 Chevy V30 4x4 wrecker challenger 4812



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