Transmission rear shaft seal question

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Unactive1

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My question is ... The inner seal is 1.5" on both of these seals. The outside is different, one is 2-1/2" and the other is 2-5\8". Is the difference just the lip? The one in my trans now is the 2-1/2". Can you use either one or no ?
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NickTransmissions

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The seal on the right is the same one that comes in all the paper/rubber kits and is what I install onto all 2WD TH350s, 700R4s and 4L60Es.
 

NickTransmissions

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Which one, ATP-H09 I'm on smartphone and its displaying the images top and bottom.
Lol. Yep, they're vertical on my phone also but was on my PC when posting yesterday.

Buy HO9 (bottom one with the wider flange)
 

Unactive1

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Lol. Yep, they're vertical on my phone also but was on my PC when posting yesterday.

Buy HO9 (bottom one with the wider flange)
Awesome, thank you for your assistance. Will order it soon as possible. Gonna replace the trans mount and filter while im at it too. The mount didn't look too great of shape. Not busted but showing a lot of weathering/age. The truck sadly baked in the GA sun/heat for many years
 

NickTransmissions

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Awesome, thank you for your assistance. Will order it soon as possible. Gonna replace the trans mount and filter while im at it too. The mount didn't look too great of shape. Not busted but showing a lot of weathering/age. The truck sadly baked in the GA sun/heat for many years
Good call to replace the trans mount. They can actually cause damage to the transmission (and even engines in extreme cases though its very rare).
 
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