89square
Junior Member
- Joined
- Dec 25, 2018
- Posts
- 26
- Reaction score
- 31
- Location
- New York
- First Name
- Willy
- Truck Year
- 1911
- Truck Model
- Truck
- Engine Size
- 111
I picked up my 1989 R3500 crew cab dually on Christmas eve with 34000 original miles from the original owner. I've never owned a 1 ton truck so this is a new world for me. They left me a binder with some info about the truck, one thing stuck out is that it has a Gear Vendor GV-400 2 speed under/overdrive trans installed, not sure if this was a factory option or if they had it put in.
I've done some reading and I think I understand the concept of the overdrive trans, but I'm not sure I fully understand how to operate this thing and was hoping you guys could set me straight. It has a foot activated switch just to the left of the brake pedal and a control module installed on the dash, the control module has a standby light and a toggle switch that is labeled 20 on the left and 40 on the right. The notes that the owner left me stated that the overdrive should be engaged at all times when not pulling a load. Is this sound advice? Additionally, when I push the switch in on the floor board, it will turn the standby light off and on, on the control module. If the standby light is on, is the overdrive engaged? Whats the difference between the 20 and the 40 on the toggle switch?
Also, they noted that the overdrive trans was due to be serviced, anything special I need to be aware of when I take it in? The only other info I have related to it was that in 2014 they had the transmission overhauled and had a HD Allison torque converter installed.
Thanks in advance!
I've done some reading and I think I understand the concept of the overdrive trans, but I'm not sure I fully understand how to operate this thing and was hoping you guys could set me straight. It has a foot activated switch just to the left of the brake pedal and a control module installed on the dash, the control module has a standby light and a toggle switch that is labeled 20 on the left and 40 on the right. The notes that the owner left me stated that the overdrive should be engaged at all times when not pulling a load. Is this sound advice? Additionally, when I push the switch in on the floor board, it will turn the standby light off and on, on the control module. If the standby light is on, is the overdrive engaged? Whats the difference between the 20 and the 40 on the toggle switch?
Also, they noted that the overdrive trans was due to be serviced, anything special I need to be aware of when I take it in? The only other info I have related to it was that in 2014 they had the transmission overhauled and had a HD Allison torque converter installed.
Thanks in advance!