Engine/Transmission (1998.5 - 2002) Gear Vendor Install on Manual

[kscheffler]

I am going to purchase a gear vendor for a 2001 6 spd with 4. 10; I need lower freeway RPM's. I have all ready received the installation manual from GV. It is a terrible manual they are trying to explain the installation procedures for all makes and models for the past 30 years with nothing specific to my truck. Anyone out there that completed an install all ready that can help me with the install? Specifically where do I tie into the speed sensor and due you need to shimn the GV coupling adaptor? I am still trying to get specific install instructions from GV. But if anyone is out there has done this install would appreciate any input on the installation.

 

[Harlan]

GV

I have instaled GV for some time now. If you get a hold of Jeff at GV he will help you and it will all come clear. I beleave that you will have to shim the coupling. But that is not hard, for they send you shims and all when you get your kit.

Harlan

 

[kscheffler]

Harlan

What is the shimming for? To correct the drive shaft angle or to provide clearance between the adapoter and the output shaft?

 

[Jumbo Jet]

Round shims are for the coupling between the GV and the transfer case. Get that right.



I installed a GV on my 5 spd. and on my Auto - both w/4. 10 gears for the same purpose you are talking about.



The GV really helps on the Auto pulling with Auto OD Off and GV OD on.



4th gear on 5spd with GV OD on is same as 5th gear with GV off.



It's not difficult to do the install.



Wiring and location of control unit was most consuming job.



I actually had to install the GV on the 5 spd. three times. Had to have the transfer case replaced because of a casting deformity. They tried to fix it once and then replaced it. Both times, I removed the GV myself before carrying it back to the dealer.



PM me or send email if you need help. I check daily, often.

 

[milehigh.o.]

kscheffler,





I know this is a little off topic from what you are asking but, what is this GV product and what exaclty does it do?



I have an 02 H. O. w/4. 10 gears and hate the high RPM's on the highway.



From what I am reading here is that this will lower the RPM's?



I looked into replacing the gears (very expensive) and going to a bigger tire (work downtown, don't know if I will fit in the garage).



Is this a cheaper alternative to the above?



Sorry for going off topic.



Russ Franke

 

[NVR FNSH]

Gear Vendors is an auxiallary gear box that bolts on to the rear of the transmission or xfer case. If you have 4wd the GV only works in 2wd since it's after the xfer case. It is a planetary gear unit with a gear ratio of . 85 (I think). It only works above ~35mph because it requires hydraulic pressure and it doesn't work with an exhaust brake. A GV will run you ~$2300 plus installation. I've looked into one for my truck and the pay back is way out there - 330K miles or something like that. Do a search on Gear Vendors and you'll find more info than you can read in one sitting.



I run 315/75R16 tires on my truck and turn 2000rpm at 66mph. I can clear a 7ft overhead - barely.



Brian

 

[Jumbo Jet]

GV ratio is . 78.

 

[Doubleclutch]

With a 4. 10 ratio, OD will be available sooner than 35. (Hydraulic pump driven by rear drive shaft rotation. ) ~30 mph in my 3:54s.

Greg

 

[kscheffler]

J. Jet

Thanks for the info. What do the round shims do? Are they to provide clearance between the end of the output shaft and adaptor? On the 5 speed application did you have to make mouting adjustements to the transmission in order to stay within the drive shaft alignment specifications. GV is hinting around that I might need to raise the transmission on it's mounts to deal with the change in drive shaft angle. I find this hard to believe; but I quess the line measurements will tell all. I am just interested if you had to do this with your 5 speed installation??

 

[GLASMITHS]

GV 1st Engagement

If you have an auto, and the GV selector is on Manuel it will engage automatic at 18mph. GV told me that it develops the 600 psi at 18mph, so that is the first shift point. If the GV selector is on auto it upshifts at 44 mph.

 

[Jumbo Jet]

What do the round shims do?



They go inside the adpater that GV provides before it slides over the original output shaft. You will use a straight edge to determine how much shimming you need to use. This keeps thrust from the output shaft damaging the GV unit.



I am just interested if you had to do this with your 5 speed installation??



No - mine was still in spec. If you did have to change the angle, it could be done with the blocks that sit between the springs and the axle.



I had a drive train shop build me a new shorter drive shaft and accepted his recommendation on the u-joint angles being in spec. So far, and after 50,000+ miles, no problems. I had also lowered my 4x4 2-1/2" by replacing the 5" block with a 2-1/2" block prior to installing the GV.



BTW - GV tells you NOT to use the steel/rubber gasket that is OEM between the XFR case and first section of output shaft. I have no idea why. I did not use it on my 5 spd. but have had it on my Auto for 29,000 miles. My 5 spd. developed a little leak with my silicone gasket, but so far the steel/rubber gasket has not leaked a drop. My warranty has expired on my GV so I didn't mind experimenting. I change the synthetic fluid every 10,000 miles. Takes just a little over a quart. Before installing on the Auto, I disassembled the sump according to the manual and cleaned the strainers. They really weren't dirty, but it made me feel better anyhow.

 

[Harlan]

GV

The shims are for coupler adjustment so the coupler is not to louse on the shafts of the out put of the trans and the impute on the GV. All so you do not wont any end pressure or thrust working on the input shaft of the GV or out put shaft of the trans. Jest checked my book and it calls for 0. 0 to . 035 Clarence. This is GV Factory specks from my install book.

Harlan

 

[kscheffler]

Thanks

Thanks for the info I am going to purchase my GV this week. Hopefully I do not need to adjust drive shaft angle... kts