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franken · 06-24-2015, 08:25 PM

A few ideas:
The diffs need the oil changed or have almost none anyway. Drop the $20 and pull a cover to find out for sure. The ratio is stamped on the ring gear.
With a 4x4, swapping diffs isn't so simple because doners (73+) don't have the right spring mount spacing. I'm guessing this is a half ton. So a 2x diff swap is impractical for $1k.
Get a tach and find out what the engine is turning in reality. This is a 46 year old truck. It isn't like a new vehicle and what its acting like is normal for the time.
What engine is in it? A 6 or original 6 truck would have a lower ratio than a V8.
I'm pretty sure the 69 trucks had a married TC, so a trans swap to OD is impractical for $1k.

06-24-2015, 08:25 PM	#28
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,052	Re: Granny Gears Too Low..Solutions ? A few ideas: The diffs need the oil changed or have almost none anyway. Drop the $20 and pull a cover to find out for sure. The ratio is stamped on the ring gear. With a 4x4, swapping diffs isn't so simple because doners (73+) don't have the right spring mount spacing. I'm guessing this is a half ton. So a 2x diff swap is impractical for $1k. Get a tach and find out what the engine is turning in reality. This is a 46 year old truck. It isn't like a new vehicle and what its acting like is normal for the time. What engine is in it? A 6 or original 6 truck would have a lower ratio than a V8. I'm pretty sure the 69 trucks had a married TC, so a trans swap to OD is impractical for $1k.