This link might help. Plus, there might be a good youtube showing the process. Good Luck!

http://www.ehow.com/how_8777242_install-reartine-tiller-model-gil39032a.html

thanks for the response, I only have two belts, model d; unless the other was not there, I cant seem to locate a manual; I have been all over the web, rustytillers, manualsonline; no luck. I did find a picture someone had posted that shows a fair amount of the belts.
If I knew the right length that would help, mine was worn down to the outside ribbon of belt, it worked ok in reverse, but i couldnt get it to grab forward; I will keep looking and post a picture and or manual if I find one.
Ed

I have an OLD Gates belt book.
The only "39000" series Gilson listed is a 39007A

Drive belt is Gates 6835- 35"X 1/2"
Reverse belt is Gates 6737- 37"X3/8"

IF the reverse belt is "good" and seems to match the above dimension, you might use it to compare the drive belt length and see if it seems like a plausible fit.

Duplicate- ignore

This post was edited by bill_kapaun on Fri, Nov 30, 12 at 14:48

I have an OLD Gates belt book.
The only "39000" series Gilson listed is a 39007A

Addition-
Found a 39011D in the MW section
Drive 6833 33X 1/2"
Reverse 6727 27x 3/8"

This post was edited by bill_kapaun on Fri, Nov 30, 12 at 13:53

The old belt was 44 1/2 and probably 3/8; I took it to the local hardware. I tried to route it, it seems a little short, or I dont have it quite right. I may call a toro dealer and try to get a manual; it ssems like I read a post here that suggested that, thanks again. I will follow up if anymore develops.

I called lawn boy and they gave me these numbers: drive belt- original # 200555 that turned into a lawn boy/toro 705361 which I crossed to a 3L460 or a Dayco L346; tine belt- original 200554 that turned into a lawn boy/toro 702603 which I crossed to a 4L460 or Dayco L446. This boils down to drive + 3/8 X 46 and tine 1/2 X 46 both in inches.