Sometime ago I was talking about the two main categories of parts in an automatic transmission. The first category are soft parts and the second category is “hard parts“. Today I will show you a hard part out of an old Borg Warner T-35 transmission. I’m going to guess the T-35 has not been made for 35 to 40 years, but it qualifies as a simple early fully automatic transmission.
The hard part we will look at and talk about is a front pump assembly. A front pump is a hard part because it is made out of steel, as opposed to a gasket which may be rubber. Rubber is then classified as a soft part.
A complete Borg Warner T-35 Front Pump Assembly:
T-35 front pump whole
When we take it apart we can see how it works and the parts inside it:
Pump Body with Gears Installed:
T-35 Pump Gear side.
Front Pump Gears:
T-35 Pump Gears
This is the basic way all gear driven font pump assemblies are made. There may be some pumps that have a bit different looks, but a gear driven pump will resemble the above pump. The theory of how it works is not as important than actually seeing what produces the large amount of internal pressure, up to 300 PSI (pound per square inch) max output.
Hard parts such as pumps do wear and eventually cause transmission malfunctions and failure. Which in most cases leaves you to locating a transmission for sale. If you are in the unenviable position of having to decide on where to get the best rebuilt transmission for your purposes, I hope what I will say next is helpful.
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