railway express truck rear end??
railway express truck rear end??
I have a complete 7-1928 rail way express AA truck in very good condition, trying to find out what rear end it has no A or b casting marks it has a small symbol than an F bellow that TT2. ANY CLUES??
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- Posts: 157
- Joined: August 31st, 2013, 4:37 pm
- Body Type: Express
- Model Year: 1929
- Location: Vallejo, Ca
Re: railway express truck rear end??
Pull the speedometer drive gear, the ratio will be stamped on the end.
- Neil Wilson
- Posts: 3062
- Joined: February 5th, 2003, 9:42 pm
- Body Type: 82-A/89-A
- Model Year: 1930
- Location: Boulder, CO
- Contact:
Re: railway express truck rear end??
The first AA's came with the 5.17:1 high speed worm drive rear axle (not markings since there was only one gear ratio). The speedometer driven gear is a good indication that the axle gears are 5.17:1. After this many years, the internal gears could have been changed.
If the rear axle is still assembled then the following procedure can be used to determine the ratio. Turn one rear wheel (with the other held stationary) for one turn and count the number of times the drive shaft or engine turns over. If you are counting engine turns, then make sure the transmission is in high (which is the 1:1 ratio or straight through position for the transmission). The count of turns times two is the axle ratio.
A 28/29 worm and bevel, high speed axle will result in slightly over 2-1/2 turns of the drive shaft to make the 5.17:1 or 5.11:1 ratios. When the drive shaft turns over 3-2/3 times the axle ratio is a low speed.
Regards, Neil Wilson
______________________________________
aafords.com@gmail.com - use this email for contact
https://aafords.com/
______________________________________
aafords.com@gmail.com - use this email for contact
https://aafords.com/