1969 Bronco 170 3 speed top speed?

[BruceAH]

My '66 came with the 170 and 4.10s, totally stock...easily topped 70 (though I'm not sure how far beyond).

 

[bmbm]

swap for 200

That 200 swap is a good move. Swap the oil pan and pickup tube from your 170. Good luck.

 

[blubuckaroo]

You've got too much tire for both the engine and gearing.
If you started with 4.11s, your effective ratio is now 3.88 with the 30-1050-15 tires. Also the tires are wider and heavier than the factory ones were. You would be a good candidate for 4.30 gears.

This reminds me of my experience with my Honda Trail 90. It would easily hit 50 mph. I wanted a bit more. I put on a rear sprocket with three less teeth. After that it would actually go faster in third gear than fourth gear, but never made it back to 50 mph with that combination.

 

[ArkyJoe]

My goal is to get to 55-60 without having to mash the pedal to the floor and be going downhill. The 200 should cure a lot of other problems Im having in the engine compartment.

 

[Speedrdr]

Had a 72 with 4. Whatevers in the chunk that the p.o. swapped in a 200 inline 6. I put a set of Clifford split headers on it and was running 75-80 mph with 3.5 inch lift and 9:00 X 16 military nondirectional tires. Speed verification by local PD. Was it safe at that speed? Oh, heck no, but was calibrating Speedo. Was it hard on engine? Yep, spun the crank in main bearings.
Randy