700R4 Length vs TH350: What's the Difference?

I’ve got a 72 C10 with a TH350. Any suggestions on what I would need to swap to a 700R4? I want to keep my build smooth and reliable.

1 Like

You might need a new driveshaft and possibly some crossmember adaptations. Just be sure to check the length—you could end up short!

I’ve read that some people report better performance with a 700R4 in heavier vehicles for towing because of that added gear. Is that true?

Definitely! The 700R4 shines in towing situations. Just keep in mind the extra work in fitting it if you’re working with a classic car setup.

That reminds me—what about the electronics involved with the 700R4? Do I need to worry about that?

5 Likes

Good point! The 700R4 requires a TV cable setup for proper function, unlike the simpler TH350. Make sure to look into that for a stress-free install.

3 Likes

For my old Camaro, I kept the TH350 because it was just easier. If your priority is simplicity, sometimes it’s better to stick with what you’ve got!

5 Likes

That’s true! But nothing beats the efficiency of a well-tuned 700R4 for daily driving. Just depends on your needs.

Why did the TH350 break up with the 700R4? Because it couldn’t handle being in a long-distance relationship! :joy: But for real, each has its merits depending on your car and what you’re after.

I’m loving the humor, but seriously—both transmissions have their place! Reflecting on my experiences, the choice should align with your driving style and vehicle setup.

The key differences between the 700R4 and TH350 are in performance and adaptability. The 700R4 has overdrive, which improves fuel efficiency for highway driving. The TH350 lacks this feature, making it less efficient but often preferred for towing applications due to its durability.

I’ve driven both! The 700R4 really shines during acceleration, especially in newer builds. It feels quicker off the line compared to the TH350.

For towing capacity, the TH350 generally holds up better under heavy loads. I’ve never had issues while hauling with it, while the 700R4 can sometimes feel like it struggles depending on the setup.

3 Likes

That’s true! I’ve noticed that the 700R4 is better for lighter loads and daily driving but lacks that heavy-duty feel.

I’ve found the fuel efficiency on the 700R4 to be significantly better, especially on long trips. I get better mileage than I ever did with the TH350.

5 Likes

Fuel efficiency is key for me too. I mostly drive city, though. TH350 still provides decent mileage for short trips.

User experience varies, but I think the 700R4 is more forgiving in terms of gear shifting. Anyone else notice that?

I’m curious about the reliability of both. Has anyone had major issues with either transmission long-term? I’m looking for something that can last.

Reliability-wise, I’ve had my TH350 for over 10 years with no major issues. But I hear the 700R4 sometimes requires more maintenance.

It’s funny how both transmissions have their rabid fans. Some swear by the TH350 for classic builds while others rave about the 700R4 for modern applications! Always a split crowd.