I'm interested in hearing from members who run a Gear Vendors unit, specifically anyone who has done more maintenance than just changing the oil. So familiarity with parts sources, assembly/disassembly do's & don'ts, diagrams, etc. From what I've found Gear Vendors doesn't sell parts but offers a "service" to refresh their overdrives but it ends up being 1/3 the cost of a new unit (I'm not taking that path). They appear to be pretty simple units and common replacement parts needed are O-rings, solenoids and the clutches.

I'm working on a truck that has a GV behind a 904 and the overdrive is not shifting (only has roughly 24k miles on it but the truck isn't used often). I know this can be low or dirty oil, faulty solenoid, bad or dry O-rings on the solenoid shaft or, bad clutches. I'm looking at a kit through Maximum Overdrive and will probably go that way to refresh this unit. I'm just looking to hear from others who have messed with these on their own.

I've had one in my Dually since 1996, and it's been bulletproof, so I have no service or parts experience.
I merely change the sump fluid every couple years (truck doesn't get used much, lives a better life than some people )
All I can offer is to check the wiring & switches.

I'm not trying to hi-jack the thread but, the GV are safe to tow with?

I'm not trying to hi-jack the thread but, the GV are safe to tow with?

my problem with gearvendors, is if you get a unit from the junkyard, such as above, they have the stones to demand a return of the chevy/ford/whatever, before they will THEN sell you the parts needed for YOUR installation.
i don't think that's right on so many levels !
maybe it's just me, but geeze...................

Thanks BD. I assume you did this without any type of assembly diagram just by replacing seals as you disassembled and the re-assembled everything when you were finished.

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I thought this would be pretty much as you described, reasonably straightforward and not too complicated. Glen did mention the need to have a bearing separator and a hydraulic press for clutch replacement. Did you replace the cone clutch on yours since it comes with the MO kit? Is the bushing you mentioned for the tail shaft ? I could see a large seal or bushing in their kit picture and wondered if that was for the tail section. The unit I'm dealing with on the pickup had been leaking out the tail shaft area and dripped down onto the exhaust cross over directly below.